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If f(x)=1/(1+e^(-1 /x)) ,x!=0 and 0,x=0...

If `f(x)=1/(1+e^(-1 /x)) ,x!=0 ` and 0,x=0 then at x=0 (A) right hand limit of f(x) exists but not left-hand limit (B) left-hand limit of f(x) exists but not right- hand limit (C) both limits exists but are not equal (D) both limits exist and are equal

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