9-20B2 C
 What statement is true regarding the exchange between two stations engaged in SITOR  (NBDP) communications?
A. In ARQ, each character is transmitted twice, with the second displaced in time from the first.
B. In ARQ, the "sending" station transmits a block of three characters and the "receiving" station responds with a one character Repeat Request.  Following this the "transmitting" station will send a new block.
C. In ARQ, the ISS transmits a block of 3 characters and the IRS checks for parity. If the received block is correct a control signal is sent notifying the ISS to proceed. If the parity check fails the block must be resent.
D. Broadcasts of Maritime Safety Information, traffic lists, etc. can be copied by the receiving station in ARQ mode.
