5A72 A
The procedure of radiotelegraph transmission in which one station answers the call of another is...?
A.KMEX KMEX KMEX DE WCXY WCXY WCXY R K
B.KMEX DE WCXY R
C.KMEX KMEX KMEX DE WCXY WCXY WCXY RRR
D.KMEX KMEX DE WCXY IMI
