Based on the E-R diagram below, choose the best corresponding business rule.

Question

BlackTom AI · Accepted Answer

The question asks for the best business rule that matches the given E-R diagram.
First, note the entities involved: ATM and Bank, connected by the relationship 'Owns'.
The diagram shows: Bank is connected to the 'Owns' relationship with a 1 on the Bank side, and ATM is connected with a many (implied) on the ATM side. This indicates that one Bank can own many ATMs, while each ATM is owned by exactly one Bank.
Option analysis:
- If there were multiple options, we would evaluate each against the diagram’s cardinalities. The key idea is that the ownership relationship is one-to-many from Bank to ATM (one Bank can own many ATMs), and many-to-one from ATM to Bank (each ATM is owned by one Bank).
- Since the provided options are missing in this prompt, we cannot comment on each alternative. However, the highlighted rule, “A bank can own many ATMs, but an ATM can be owned by one bank,” precisely captures the one-to-many relationship depicted: Bank (1) — Owns — ATM (many) from the Bank’s perspective, and ATM (many) — Owns — Bank (1) from the ATM’s perspective, reinforcing that each ATM has exactly one owner.
If there were other choices, we would compare them to ensure they reflect the same cardinalities and rule out statements that imply, for example, that an ATM could be owned by multiple banks or that a bank can own zero or no ATMs, which would contradict the diagram’s implied mandatory ownership on the ATM side.

HADM3740/HADM6740 Entity-Relationship Model (Cont.) Quiz

Based on the E-R diagram below, choose the best corresponding business rule.

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