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The equation |z-i|+|z+i|=k, k gt 0 can r...

The equation `|z-i|+|z+i|=k, k gt 0` can represent an ellipse, if k=

A

an ellipse if `kgt2`

B

line segment if k = 2

C

an ellipse if k = 5

D

line segment if k = 1

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The correct Answer is:
A,B,C
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