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If z1 and z2 lies on |z|=9 and |z-3-4i|=...

If `z_1` and `z_2` lies on `|z|=9` and `|z-3-4i|=4` respectively, find minimum possible value of `|z_1 -z_2|` (A) `0` (B) `5` (C) `13` (D) `2`

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