Let \( \mathrm{f} \) be a real valued function such that for any real \( x \), \( f(15+x)=f(15-x...

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Let \( \mathrm{f} \) be a real valued function such that for any real \( x \), \( f(15+x)=f(15-x) \) and \( f(30+x)=-f(30-x) \). Then which of the following statement is true?
(a) \( f \) is odd
(b) \( f \) is even
(c) \( f \) is periodic
(d) \( f \) is not periodic
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