 Hello and welcome to the session. Today I will help you with the following question. The question says, which are the prisons among the following? First let's see what a prism is. A prism is a polyhedron whose base and top are congruent polyguns and whose other faces that is lateral faces, plilograms in shape. Definition of prism is taken as the key idea for this question. Let's have a look at the figures one by one. The first figure is of a nail. This figure does not satisfy the conditions of a prism. Like the base and the top of this figure are not congruent polyguns and the other faces are not parallelograms in shape. Therefore the figure one that is of a nail is not a prism. Let's see the next figure that is of an unsharpened pencil. This figure is a prism because it satisfies all the conditions of the prism. The base and the top are congruent polyguns and the lateral faces are parallelograms in shape. So this is a prism. Now the next figure is of a table weight. In this figure the base and the top are not congruent polyguns and the lateral faces are also not parallelogram in shape. Therefore this is also not a prism. The last figure is of a box. In this figure the base and the top are congruent polyguns and the lateral faces are also parallelogram in shape. Therefore this satisfies the conditions of a prism. Hence a box is a prism. So in the solution we write that figure two and four are prisms. Hence our final answer is only two and four. So hope you enjoyed this session. Have a good day.