In which case is the IOPP Certificate of an inspected vessel NOT invalidated? （）

A、A.The required oily-water separator malfunctions

B、B.The ship is transferred to Liberian registry

C、C.An annual survey is conducted fifteen months after the date of certificate issuance

D、D.A 15 ppm oily-water separator is replaced by a 100 ppm oily-water separator

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