BOTH INTERNATIONAL & INLAND A rigid replica of the International Code flag "A" may be shown by a vessel __________.

Correct Answer: Option B — engaged in diving operations

COLREGS Rule 27(d)(iii) requires vessels engaged in diving operations to exhibit a rigid replica of the International Code flag 'A' not less than 1 meter in height, ensuring all-around visibility to warn mariners of subsurface divers and restricted maneuverability.