3 (costheta , sintheta). This is because point P is in the first quadrant, and in the first quadrant, both the x and y values are positive. Option 1 simply switched sin and cos, which is wrong. Option 2 switched sin and cos as well as takes place in the 4th quadrant (-x and -y). The 4th option is also in the 4th quadrant.
I hope this Helps!
