A SMC is not valid unless the Company holds a valid DOC for that ship type
A.
As long a valid DOC is available,a SMC is valid
B.
As long a as valid DOC for the ship type is available,a SMC is valid
C.
As long a valid SMC is available,a DOC is valid
D.
As long a as valid SMC for the ship type is available,a DCO is valid