Select all the true statements.
1 - Three dimensional (3D) composite shapes are made of two or more shapes put together.
2 - To calculate the surface area of a 3D composite shape, find the outside surface area of each shape and then add the surface areas together.
3 - Surface area is the amount of space, measured in cubic units, that an object or substance occupies
4 - Surface area is the sum of the areas of all faces (or surfaces) on a 3D shape.