Question: In a System Sequence Diagram, what does a message arrow indicate? Select one: a . Data flow between classes. b . Synchronous method invocation within

In a System Sequence Diagram, what does a message arrow indicate?
Select one:
a. Data flow between classes.
b. Synchronous method invocation within a class.
c. Communication between an actor and the system.
d. Control flow between use cases.

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