题目：
Which of the following is false?（）
A.A company should develop a SMS and implement it
B.A company implementing a SMS properly may obtain a DOC
C.Once a company obtains its DOC, each vessel of this company will obtain a SMC
D.DOC is valid for 60 months unless “major non-conformity” is found
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
