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`z_1, z_2, z_3` are three points lying on the circle `absz=1` , maximum value of `abs(z_1-z_2)^2+abs(z_2-z_3)^2+abs(z_3-z_1)^2` is

A

6

B

9

C

12

D

15

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The correct Answer is:
B
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