An OPT sequence diagram frame:

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BlackTom AI · Accepted Answer

The question presented is: 'An OPT sequence diagram frame:' with no answer options provided. Because the option list is missing, we cannot perform a standard option-by-option comparison. The single given statement in the data is: 'is a portion of an interaction path that may be done.'

First, consider what an OPT fragment represents in UML sequence diagrams. An OPT (optional) frame models a portion of the interaction that may or may not occur, depending on a condition or guard. It captures optional behavior within the overall interaction without forcing it to execute every time.

Now, evaluate the statement in light of that concept. The claim that an OPT frame is a portion of the interaction path that may be done aligns with the core meaning of optionality: the steps inside the OPT frame are candidates for execution, but they are not guaranteed to happen. This understanding correctly distinguishes OPT from other fragments like LOOP (repetitive behavior), ALT (alternative branches where one path must occur), or BREAK (termination of an interaction path).

Potential misconceptions to avoid:
- Confusing OPT with a mandatory path: OPT is not required every time; it is conditional.
- Thinking OPT implies parallel or simultaneous execution: OPT denotes optional sequential steps, not parallelism.
- Assuming OPT is about a single action rather than a sequence of interactions: an OPT frame can contain multiple messages and lifelines just like any other fragment.

Since no other answer options are present for comparison, we cannot assess which alternative is more correct or incorrect. If options were available, we would compare each against the UML definitions of interaction fragments and determine which best matches the concept of an optional fragment.

FIT2001_S1_2025 Applied Quiz Practice for Exam (Weeks 2-12) - Questions are by topics

An OPT sequence diagram frame:

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