The acronym SITOR stands for:

Correct Answer: Option B — Simplex TELEX Over Radio or Simplex Teleprinter over Radio

SITOR stands for Simplex TELEX Over Radio. This system utilizes Narrow Band Direct Printing (NBDP) to provide error-corrected text communications. It operates in either Automatic Repeat Request (ARQ) mode for point-to-point links or Forward Error Correction (FEC) mode for broadcast transmissions, adhering to international maritime radio standards.