Cylinder and its surface area

Q.

I have 2 road rollers. These road rollers are joined end to end along the flat surfaces to form a combined longer road roller. What are the surfaces present in the new road roller?

1. 2 flat surfaces, 2 curved surfaces

2. 2 flat surfaces, 1 curved surface

3. 1 flat surface, 2 curved surfaces

4. 1 flat surface, 1 curved surface