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The value of a and b such that the funct...

The value of a and b such that the function defined by
`f(x) = {(7,",","if" x le 2),(ax+b,",","if" 2 lt x lt 9),(21,",","if" x ge 9):}`, is continuous on its domain are

A

`a = 3, b = 2`

B

`a =2, b = 3`

C

`a =7, b = 9`

D

none of these

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The correct Answer is:
B
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