9. Your vessel is a deep draught vessel and constrained by her draught. What sound signals you should sound in restricted visibility?
(A) One prolonged followed by two short blasts at intervals of not more than 2 minutes.
(B) One prolonged blast at intervals of not more than 2 minutes.
(C) Two prolonged blasts at intervals of not more than 2 minutes.
(D) Four short blasts at intervals of not more than 2 minutes.