The point((s),at which the function f gi...

The point((s),at which the function f given by `f(x)= { ((x)/(|x|),x<0),(-1,x>=0):}` is continuous,is/are:
a) `x` in `R`,
b) `x=0`
c) x in `R``-``{0}`,
d) `x=-1` and `1`

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