Answer:
A, B, and C.
Explanation:
The bases of a cylinder are described by the following choices:
A. Parallel: Yes, the bases of a cylinder are parallel to each other.
B. Discs: Yes, the bases of a cylinder can be thought of as circular discs.
C. Congruent: Yes, the bases of a cylinder are congruent to each other, meaning they have the same size and shape.
D. Polyhedrons: No, the bases of a cylinder are not polyhedrons. Polyhedrons are three-dimensional figures with flat polygonal faces, while the bases of a cylinder are circular and curved.
So, the correct choices are A, B, and C.