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Read the following writeup carefully: In argand plane |z| represent the distance of a point z from the origin. In general |z_1-z_2| represent the distance between two points z_1 and z_2. Also for a general moving point z in argand plane, if arg(z) =theta, then z=|z|e^(itheta), where e^(itheta) = cos theta + isintheta. Now answer the following question [|z-z_1|-|z-z_2|]=t, where t is real parameter always represents

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ellipse
hyperbola
circle
None of these

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