If f(x)=[(8^(1/x),x < 0) ,(a[x], a in R-...

If `f(x)=[(8^(1/x),x < 0) ,(a[x], a in R-{0} x >= 0)],` where [.] denotes the greatest integer function. Then `f(x)` (A) continous only at finite number of points (B) discontinous at finite number of points (C) discontinous at infinite number of points (D) discontinous at x=0

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