7-90J5 C
 During ARQ communications, which of these is least likely to cause a coast station to immediately break the phased radio connection:
A. If the automatic exchange of answerbacks is interrupted by keyboard entries.
B. If the error percentage of repeat requests becomes too high.
C. If the operator enters "KKKK" at the end of the message.
D. If the BRK+? Command is transmitted after time and charges are received.
