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A particle is moving in the xy-plane along a curve C passing through the point (3, 3). The tangent to the curve C at the point P meets the x-axis at Q. If the y-axis bisects the segment PQ, then C is a parabola with

1. Length of latus rectum 3
2. Length of latus rectum 6
3. Focus ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 0 , 3 4
4. Focus ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 4 3 , 0

Correct answer: Length of latus rectum 3

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