Only Alejandro's net is correct.
Option A.
Explanation:
Octagonal prism is one of the set of prisms out of the infinite sets of the prisms. This type of prism is formed with the help of the two octagon caps which are regular.
Along with these octagonal caps, the square sides are also used to form the octagonal prism. Thus the total sides by the face of the octagonal prism is eight plus two.
