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if f(x)=(x -4) (x-5) (x-6) (x-7) then....

if f(x)=(x -4) (x-5) (x-6) (x-7) then.

A

f'(x) = 0 has four real roots

B

three roots of f'(x) = 0 lie in `(4,5) uu (5,6) uu(6,7)`

C

the equation f'(x) = has only two roots

D

three roots of f'(x) = 0 lie `(3,4) uu(4,5) uu(5,6)`

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The correct Answer is:
B
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