What signal is used to allow a scanning receiver to stop and det

What signal is used to allow a scanning receiver to stop and detect an MF or HF DSC distress message?

A.A two-tone alarm code is received.

B.A series of four-second dashes are received.

C.a 200-bit 100-baud dot pattern is received.

D.A steady audio alarm is received. allowing the operator to select the desired frequency for the reception of the message.

正确答案是C