Below you are given four parametric equations and their Cartesian equations. Match each Cartesian equation to the correct set of parametric equations.

A. $x=\sin(\theta),\;\;y=\cos(\theta),\;\;0 \le \theta \le \pi$
B. $x=4\cos(\theta),\;\;y=5\sin(\theta),\;\;-\pi/2 \le \theta \le \pi/2$
C. $x=\sin^2(\theta),\;\;y=\cos^2(\theta)$
D. $x=\sec(\theta),\;\;y=\tan(\theta),\;\;-\pi/2 < \theta < \pi/2$

1. $x^2+y^2=1,\;\;x \ge 0$
2. $x+y=1,\;\;0 \le x \le 1$
3. $\left(\dfrac{x}{4}\right)^2+\left(\dfrac{y}{5}\right)^2=1,\;\;x \ge 0$
4. $x^2-y^2=1,\;\;x \ge 1$