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If z1=10+6iandz2=4+2i be two complex num...

If `z_1=10+6i`and`z_2=4+2i` be two complex numbers and `z` be a complex number such that `a r g((z-z_1)/(z-z_2))=pi/4` , then locus of `z` is an arc of a circle whose
(a) centre is `5+7i`
(b) centre is `7+5i`
(c) radius is `sqrt(26)`
(d) radius is `sqrt(13)`

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