ER Modelling A

Assuming that common sense applies, which one of the following ER model fragments is most believable?

Question

ER Modelling A

Assuming that common sense applies, which one of the following ER model fragments is most believable?

BlackTom AI · Accepted Answer

Question restatement: The prompt asks, under common-sense assumptions, which ER model fragment is most believable among the given options A, B, C, and D.

Option A analysis: This fragment appears to show a straightforward connection between Student and Exam with a single relationship line. Interpreting common-sense semantics, a student can take multiple exams, and an exam can be taken by many students, which corresponds to a many-to-many relationship. The diagram in A seems to reflect a simple, plausible pairing without implying unusual constraints, making it a believable ER fragment.

Option B analysis: This option depicts what looks like a more constrained or nonstandard notation (for example, double lines or unusual endpoints) that could imply mandatory participation or a different, less conventional relationship semantics. Such constraints are less typically assumed as the default in a general ER modeling scenario, so this fragment is less believable as a standard interpretation.

Option C analysis: This fragment shows a small circle at the Student side and perhaps a different symbol at the Exam side, which might suggest an optional or oddly constrained participation that does not align with the common-sense expectation that students and exams relate through taking instances. The atypical symbolism introduces ambiguity and makes it a weaker candidate for a “most believable” ER model.

Option D analysis: This choice appears to enact another variant of the connection with marked endpoints that imply a specific directional or constrained interpretation. Without a standard justification for such constraints in a generic educational modeling scenario, this fragment seems less plausible as the typical ER depiction for the Student–Exam relationship.

Synthesis and comparative reasoning: Among the four fragments, Option A provides the clearest, simplest, and most typical representation of the relationship between Student and Exam under common-sense assumptions—namely, a many-to-many association where students can take multiple exams and exams can be taken by multiple students. The other options introduce special notations or constraints that are either unusual or unnecessarily restrictive for the general case, making them less believable as a standard ER model.

Note on caveats: If a specific notation standard (e.g., identifying relationships, mandatory participation, or specialization) were given in the course material, some of the other options could become plausible. However, with no additional context indicating such specialized constraints, Option A remains the most reasonable and believable interpretation.

INFO20003_2025_SM2 MINI Practice Exam

ER Modelling A Assuming that common sense applies, which one of the following ER model fragments is most believable?

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