If f(x) = {:((x^(4)-64x)/(sqrt(x^(2)+9)-...

If `f(x) = {:((x^(4)-64x)/(sqrt(x^(2)+9)-5),",",x != 4),(k,",",x =4):}` is continous at `x = 4`, then `k = `

A

(a) 60

B

(b) 120

C

(c) 180

D

(d) 240

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The correct Answer is:

D

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