If the imaginary part of (2 + i)/(ai - 1...

If the imaginary part of `(2 + i)/(ai - 1)` is zero, where a is a real number, then the value of a is equal to a)`(1)/(2)` b)2 c)`-(1)/(2)` d)-2

A

`(1)/(2)`

B

2

C

`-(1)/(2)`

D

-2

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The correct Answer is:

C

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