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Let f(x) = {:{(ax+3,xle2),(a^2x-1,x>2):}...

Let `f(x) = {:{(ax+3,xle2),(a^2x-1,x>2):}`. Then the value of 'a' for which 'f' is continuous for all x are

A

1 and -2

B

1 and 2

C

`-1 and 2`

D

`-1 and -2`

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