根据《1979年国际海上搜寻救助公约》,"Uncertainty phase" is()
(A)A generic term meaning, as the case may be,uncertainty phase, alert phase or distress phase.
(B)A situation where in uncertainty exists as to the safety of a vessel and the persons on board.
(C)A situation wherein apprehension exists as to the safety of a vessel and of the persons on board.
(D)A situation wherein there is a reasonable certainty that a vessel or a person is threatened by grave and imminent danger and requires immediate assistance.
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