Which one is correct?

The point P= (8, 5, 7). Determine the coordinates for A. Which is a true statement? (a) Ry is referred to as the real number line, so for each of the x-coordinates for any point on the line is a real number or {x, where x is a real number) (b) R" is referred to as the xy-plane, so for each of the x- and y-coordinates for any point on the plane are real numbers or [(x, y) where x and y are real numbers] q R" is referred to as three space, so for each of the x-, yo, and z-coordinates for any point in space are real numbers or ((x, y. z) where x, yand z are real numbers] O d) none of the above