What are the common designators for connectors?

The choice indicating that "J" stands for Jack and "P" stands for Plug is indeed correct because these designators are standard within the electrical and electronics industry to differentiate between types of connectors.

A jack is typically a socket designed to receive a plug, and thus, the use of "J" is a logical designation for identifying ports where a connection is made. On the other hand, a plug is a device that connects to a jack to create an electrical connection, hence the designation "P". This terminology is widely adopted and recognized across various fields, including audio, video, and networking equipment. Using these designators helps ensure clarity in communication about connector types, making it easier for professionals to understand and work with designs involving multiple components and connections.

In the context of the other options, they either use incorrect or less common designators for connectors, which may lead to confusion in professional or academic settings. Therefore, recognizing "J for Jack" and "P for Plug" maintains consistency with widely accepted electrical engineering terminology.