Aright rectangular prism has a length of 6 inches, a width of 7 inches, and a height of 8 inches. if a plane slices the prism in half, parallel to its smallest face, which of the following describes the shape of the two-dimensional cross-section? a. a 7-inch by 7-inch square b. a 7-inch by 8-inch rectangle c. a 6-inch by 8-inch square d. a 6-inch by 7-inch rectangle