The solid figure is represented by the second option.
Explanation:
- The solid figure in the question is a cuboid. 
 - On opening, it will have 6 faces, each of which will be a rectangle. 
 - All the corners or edges will have 90° or right angles. 
 - Also, on opening, one side will have 2 other faces attached to it on top and bottom which is seen in the second figure.