The rectangular prism below has two congruent square faces and four congruent rectangular faces. The line segment formed by connecting vertices E and B is 17 units long, the line segment formed by connecting vertices G and E is 14 units long, and the line segment formed by connecting vertices H and A is 17 units long.

If the rectangular prism is sliced by a plane that passes through vertices H, C, and A, which of the following best describes the resulting cross-section of the prism?
A.
a square with side lengths of 17 units

B.
a rectangle with a length of 17 units and a width of 14 units

C.
a triangle with side lengths of 17 units, 14 units, and 17 units

D.
a triangle with a height of 17 units and a base of 14 units