A point moves in a plane so that its dis...

A point moves in a plane so that its distance PA and PB from who fixed points A and B in the plane satisfy the relation `P A-P B=k(k!=0)` then the locus of `P` is a. a hyperbola b. a branch of the locus of `P` is c. a parabola d. an ellipse

A

a parabola

B

an ellipse

C

a hyperbola

D

a branch of a hyperbola

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