RADAR instructs aircraft XY-ABC: `X-BC reset squawk 1015`. What does this mean:

Question

Domanda PPL(A) - Licenza Pilota Privato (Aerei) - Comunicazioni in inglese

QuizVDS · Accepted Answer

X-BC is requested to reselect SSR code 1015

QuizVDS · Answer

X-BC is requested to set new code 1015

QuizVDS · Answer

X-BC is requested to set new code 1015

QuizVDS · Answer

X-BC has been identified at 10:15 (UTC)

Id 90 - ppl(A) - RADAR instructs aircraft XY-ABC: `X-BC reset squawk 1015`. What does this mean: