If \( f(x)=|x-a| \phi(x) \), where \( \phi(x) \) is continuous func...

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If \( f(x)=|x-a| \phi(x) \), where \( \phi(x) \) is continuous function, then
(a) \( f^{\prime}\left(a^{+}\right)=\phi(a) \)
(b) \( f^{\prime}\left(a^{-}\right)=-\phi(a) \)
(c) \( f^{\prime}\left(a^{+}\right)=f^{\prime}\left(a^{-}\right) \)
(d) none of these
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