FAN IN of a component A is defined as
2013
FAN IN of a component A is defined as
- A.
Number of components that can call or pass control to component A.
- B.
Number of components that are called by component A.
- C.
Number of components related to component A.
- D.
Number of components dependent on component A.
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Correct answer: A
Definition: Fan-in of a component A is the number of distinct components that can call or pass control to component A.
Example: If three different components invoke component A, then the fan-in of component A is 3.
Contrast with fan-out: Fan-out counts how many components are called by component A (i.e., the number of callees), whereas fan-in counts the callers.
Practical note: A high fan-in indicates the component is widely reused or central; this can be beneficial for reuse but may also create a single point of contention or bottleneck.
Use precise wording when identifying fan-in: count the distinct components that can call or pass control to the component in question.