Write One or More Inequalities That Describe the Set of Points

Multiple Choice

Write one or more inequalities that describe the set of points.
-The rectangular solid in the first octant bounded by the planes x = 5, x = 8, y = 7, y = 9, z = 6 and z = 7 (planes excluded)

A) The given planes do not form a rectangular solid
B) x < y < z
C) 5 < x < 8; 7 < y < 9; 6 < z < 7
D) x < 5, x > 8; y < 7, y > 9; z < 6, z > 7