RADAR instructs aircraft X-BC:'X-BC squawk standby '. What does this mean?

Question

Question ATPL - Airline Transport Pilot license - VFR Communications

QuizVDS · Accepted Answer

X-BC is requested to switch to standby position

QuizVDS · Answer

X-BC is requested to standby on the frequency

QuizVDS · Answer

X-BC is requested to standby for radar vectors

QuizVDS · Answer

X-BC is requested to standby as the radar controller is busy

Id 87 - ATPL - RADAR instructs aircraft X-BC:'X-BC squawk standby '. What does this mean?