If f(x) = {{:(2x^(2) + 3x +4, x lt 1),(k...

If `f(x) = {{:(2x^(2) + 3x +4, x lt 1),(kx+9-k, x ge 1):}` is differentiable at `x=1`,
then `k` is equal to

A

6

B

7

C

4

D

5

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The correct Answer is:

B

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