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Let f(x) ={{:((x-4)/(|x-4|)+a,xlt4),(a+b...

`Let f(x) ={{:((x-4)/(|x-4|)+a,xlt4),(a+b,x=4),( (x-4)/(|x-4|)+b, x gt4):}`
then f(x) is continuous at x=4 when

A

a=0, b=0

B

a=1,b=1

C

a=-1,b=1

D

a=1,b=-1

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