If f (x) = {{:(x + 1 , x le 1), (3 - ax^...

If `f (x) = {{:(x + 1 , x le 1), (3 - ax^(2) ,x gt 1):}` is continuous at x =1, then the value of a is

A

`-1`

B

2

C

`-3`

D

1

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