Solve the Problem $\sqrt { \mathrm { z } ^ { 2 } + \mathrm { x } ^ { 2 } }$

Multiple Choice

Solve the problem.
-Find a formula for the distance from the point P(x, y, z) to the xz plane.

A) $\sqrt { \mathrm { z } ^ { 2 } + \mathrm { x } ^ { 2 } }$
B) $z$
C) $y$
D) $x$