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If a function `f(x)` has `f^(prime)(a)=0a n df^(a)=0,` then `x=a` is a maximum for `f(x)` `x=a` is a minimum for `f(x)` it is difficult to say `(a)a n d(b)` `f(x)` is necessarily a constant function.

A

x = a is a maximum for f (x)

B

x = a is a minimum for f(x)

C

It is difficult to say (a) and (b)

D

f(x) is necessarily a constant function

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The correct Answer is:
C
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