What does an opt combined fragment represent?

What does an opt combined fragment represent?

• A. Represents a set of optional event occurrences that could happen during an execution if a guard evaluates to true
• B. Represents two or more alternative sets of event occurrences
• C. Represents a loop of event occurrences
• D. Represents parallel event occurrences

Answer: (A)

An opt combined fragment models optional behavior controlled by a guard. It represents a set of event occurrences that may happen during an execution, but only if the guard condition evaluates to true. If the guard is false, the content inside the fragment is skipped. This is different from other fragment types: a parallel fragment runs things concurrently, a loop repeats as long as a condition holds, and an alternative fragment chooses one of several possible paths. So the opt fragment specifically captures optional behavior that may or may not occur depending on the guard.

An opt combined fragment models optional behavior controlled by a guard. It represents a set of event occurrences that may happen during an execution, but only if the guard condition evaluates to true. If the guard is false, the content inside the fragment is skipped. This is different from other fragment types: a parallel fragment runs things concurrently, a loop repeats as long as a condition holds, and an alternative fragment chooses one of several possible paths. So the opt fragment specifically captures optional behavior that may or may not occur depending on the guard.