If the imaginary part of frac{2+i}{ai-1}...

If the imaginary part of `frac{2+i}{ai-1}` is zero where `a` is real number, then the value of a is equal to

A

`A.frac{1}{2}`

B

`B.2`

C

`C.-frac{1]{2}`

D

`D.-2`

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