What Region Of $\mathbb { R } ^ { 3 }$

Multiple Choice

What region of $\mathbb { R } ^ { 3 }$ is represented by the equation z = 3?

A) line parallel to the xy-plane
B) line parallel to the xz-plane
C) line parallel to the yz-plane
D) plane parallel to the xz-plane
E) plane parallel to the xy-plane
F) line perpendicular to the xy-plane
G) line perpendicular to the xz-plane
H) line perpendicular to the yz-plane