Q .     Let `z\ne -i` be any complex number such that `\frac {z-i}{z+i}` is a purely imaginary number. Then `z+\frac {1}{z}` is :

JEE 2014 Mains Paper 2
A

`0`

B

Any non-zero real number other than 1.

C

Any non-zero real number.

D

A purely imaginary number.

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