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

Let `f(x) =(x-4) (x-5) (x-6) (x-7)` then :

A

`f(x) = 0` has 4 roots

B

`f'(x) =0` has 3 distinct real roots

C

`f'(x) = 0` has only 1 real root

D

`f'(x) = 0` has two equal roots

Verified by Experts

The correct Answer is:

B

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