A component with high fan-in is typically characterized by which property?

A component with high fan-in is typically characterized by which property?

• A. Difficult to reuse by others
• B. Has many outgoing dependencies
• C. Has no incoming dependencies
• D. Widely reused by many other components

Answer: (D)

Fan-in measures how many other components rely on a given component. When fan-in is high, many components depend on this one, so it’s widely reused by many other components. That’s exactly what the property describes. The other options describe different ideas: having many outgoing dependencies points to high fan-out rather than fan-in; having no incoming dependencies means no one depends on it, which is the opposite of high fan-in; and being difficult to reuse would typically correspond to low fan-in.

Fan-in measures how many other components rely on a given component. When fan-in is high, many components depend on this one, so it’s widely reused by many other components. That’s exactly what the property describes.

The other options describe different ideas: having many outgoing dependencies points to high fan-out rather than fan-in; having no incoming dependencies means no one depends on it, which is the opposite of high fan-in; and being difficult to reuse would typically correspond to low fan-in.