What is a wait time action?

• A. An accept event action that waits for a time event occurrence.
• B. An object flow that passes data between nodes.
• C. A send signal action.
• D. A call behavior action that activates a sub-behavior.

Answer: (A)

A wait time action is modeled as an accept-event action that sits and waits for a time event to occur. In UML activity diagrams, this means the action blocks the flow until the designated time elapses, then the activity continues. It’s not about moving data between nodes (that would be an object flow), not about sending a signal, and not about calling a sub-behavior. The key idea is waiting for a TimeEvent to trigger the continuation of the activity.