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Which answer is consistent with Rule 38 — Exemptions?
A
1 short = starboard, 2 short = port, 3 short = astern propulsion.
B
Vessels which comply with earlier regulations may be exempted from certain requirements for specified periods.
C
Underway and making way: 1 prolonged every 2 minutes.
D
She may in addition sound one short, one prolonged and one short blast to warn of her position and of possible collision.