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If p p p is a prime number, which of the following must be true?
I.p is odd.II.p is not divisible by 6.III.p is not divisible by 7.\begin{array}{r r l} &\text{I.} & p\ \text{is odd.}\\ &\text{II.} & p\ \text{is not divisible by}\ 6.\\ &\text{III.} & p\ \text{is not divisible by}\ 7.\\ \end{array}I.II.III.p is odd.p is not divisible by 6.p is not divisible by 7.
(A) \ \ I only (B) \ \ II only (C) \ \ I and II only (D) \ \ I and III only (E) \ \ II and III only
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