If
f(x)=3+(1+7^((1)/(1-x)))^(-1)
then : (A) (
/Lim _((
)
x->\Gamma ^(\Gamma ))f(x)=4
(B) (
x->1^(+))f(x)=3
(C) (
x->\pi ^(+))f(x)=5
sin((\pi )/(7))
(D) fhas irremovable discontinuity at
x=1