The edge of each cube used to build this rectangular prism is 12 inch long. Which equation shows the volume of the prism, in cubic inches?
(42 • 22 • 32) in.3 = 3 in.3
(82 • 62 • 122) in.3 = 72 in.3
(4 • 2 • 3) in.3 = 24 in.3
(412 • 212 • 312) in.3 = 3938 in.3