The equation sqrt((x-5)^(2)+y^(2))+sqrt(...

The equation `sqrt((x-5)^(2)+y^(2))+sqrt((x+5)^(2)+y^(2))=k` represents
(A) Line segment if `k=10`
(B) Ellipse if `k>10`
(C) Line segment if `k=5`
(D) Ellipse if `0< k <10`

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