What does the term "ARQ" mean in SITOR operations?

Correct Answer: Option B — Automatic Repeat Request

ARQ stands for Automatic Repeat Request. In SITOR/NBDP operations, this mode establishes a synchronous, point-to-point link where the receiving station verifies the integrity of each character block. If an error is detected, the receiver automatically requests a repeat of the specific data block from the transmitting station.