Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to build a concrete foundation [title] Choose the type of foundation to build. [step] The type of foundation depends on the area of the foundation will be located on and the type of structure that will be placed on it. [substeps] Shallow foundations are built on level ground and hard surfaces.

Ending1: They need to be elevated with a railing or a wire gate before entering the area. Medium foundations use stands or benches built on rocks at the bottom of the drop off area. Ending2: Low and compact foundations are built on concrete ground and have minimal concrete features. [title] Choose the level of the site where you want your foundation to go. Ending3: Shallow foundations are no more than 3 feet (91.44 cm) deep and are used primarily for smaller, simpler projects like holding patio furniture, a fountain, or an air conditioning unit. Deep foundations are used for more complex projects. Ending4: Concrete will require some compaction to accommodate built foundations. Concrete will require some compaction, otherwise the area won't be properly tilled.

Answer format: ending1/ending2/ending3/ending4