Consider a pyramid OPQRS located in the first octant $(x \geq 0, y \geq 0, z \geq 0)$ with O as the origin and OP along the X-axis and OR along the Y-axis, respectively. The base OPQRS of the pyramid is a square with $OP=3$. The point S is directly above the midpoint T of diagonal OQ such that $TS=3$. Then,