The common tangents to the circle x² + y² = 2 and the parabola y² = 8x touch the circle at the points P, Q and the parabola at the points R, S. Then the length of the diagonal PR of quadrilateral PQRS is ?
1
2√2
2
3√ 2
3
4√2
4
5√2
The common tangents to the circle x² + y² = 2 and the parabola y² = 8x touch the circle at the points P, Q and the parabola at the points R, S. Then the length of the diagonal PR of quadrilateral PQRS is ?