Let f(x)={{:(cx^(2)+2x",","if ",xlt2),(2...

Let `f(x)={{:(cx^(2)+2x",","if ",xlt2),(2x+4",","if ",xgt2):}`
If the function f is continuous on `(-oo,oo)`, then the value of c is equal to

A

4

B

2

C

3

D

1

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