Which statement best describes a signal event?

Which statement best describes a signal event?

• A. Represents the receipt of a signal instance by a target structure that's receptive to it
• B. Represents the emission of a signal from a source unrelated to the target
• C. Represents a time-based timer event
• D. Represents a call to invoke an operation

Answer: (A)

Signal events capture asynchronous communication where a signal is delivered to a target that is able to handle it. The best description is that it represents the receipt of a signal instance by a target structure that’s receptive to it. This emphasizes that the event is about the receiver getting and processing the signal, not about sending it. The other ideas describe different concepts: emitting a signal from a source to a target is about the act of sending, not the reception event; a timer event is based on passing time rather than signaling; and a call to invoke an operation is a direct, synchronous invocation rather than an asynchronous signal delivery.

Signal events capture asynchronous communication where a signal is delivered to a target that is able to handle it. The best description is that it represents the receipt of a signal instance by a target structure that’s receptive to it. This emphasizes that the event is about the receiver getting and processing the signal, not about sending it.

The other ideas describe different concepts: emitting a signal from a source to a target is about the act of sending, not the reception event; a timer event is based on passing time rather than signaling; and a call to invoke an operation is a direct, synchronous invocation rather than an asynchronous signal delivery.