Describe the graph of the equation. r = 15 sin 5t i + 15 cos 51 j O Itis a circle of radius 15 in the xy-plane, with center at (5, 5). O It is a circle of radius 15 in the xy-plane, with center at the origin. O It is an ellipse in the xy-plane, centered at the origin, with major axis of length 15. O It is a parabola in the xy-plane, with vertex at the origin. O It is a circle of radius 5 in the xy-plane, with center at the origin.

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