An ellipse in the first quadrant is tangent to co-ordinate axes. If one focus is \( F_{1}(3,7) \...

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An ellipse in the first quadrant is tangent to co-ordinate axes.
If one focus is \( F_{1}(3,7) \) and other focus is \( F_{2}(\mathrm{~d}, 7) \) then the value of \( \sqrt{3 d} \) is equal to
(a) 5
(b) 7
(c) 14
(d) 49
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