if for the complex numbers z1 and z2 abs...

if for the complex numbers `z_1` and `z_2` `abs(1-barz_1z_2)^2-abs(z_1-z_2)^2 = k(1-abs(z_1)^2)(1-abs(z_2)^2)`, then k is equal to

A

1) `1`

B

2) `-1`

C

3) `2`

D

4) `4`

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