If the fucntion f(x)={{:(asqrt(x+7),,,0l...

If the fucntion `f(x)={{:(asqrt(x+7),,,0lexlt2),(bx+5,,,x ge2):}` is differentiable `AA x ge0`, then `2a+4b` is equal to

A

1

B

5

C

4

D

9

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The correct Answer is:

A

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