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If {{:(2+x",", x ge0),(4-x",", x lt 0):}...

If `{{:(2+x",", x ge0),(4-x",", x lt 0):},` a then `f (f(x))` is given by :

A

`f (f(x)) ={{:(4+x",", x ge0),(6-x"," , x lt 0):}`

B

`f (f(x)) ={{:(4+x",", x ge0),(x"," , x lt 0):}`

C

`f (f(x)) ={{:(4-x",", x ge0),(x"," , x lt 0):}`

D

`f (f(x)) ={{:(4-x",", x ge0),(x+2x"," , x lt 0):}`

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The correct Answer is:
A
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