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

The point(s), at which the function f given by `f(x) ={((x)/(|x|)",", x lt 0),(-1",", x ge 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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