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Let P be a point on the parabola y 2 = 4ax, where a > 0. The normal to the parabola at P meets the x - axis at a point Q. The area of the triangle PFQ, where F is the focus of the parabola, is 120. If the slope m of the normal and a are both p ositive integers, then the pair (a, m) is

1. (2, 3)
2. (1, 3)
3. (2, 4)
4. (3, 4)

Correct answer: (2, 3)

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