Correct Answer - Option 3 : Strip foundation
Strip footing:
A strip footing is another type of spread footing which is provided for a load-bearing wall. The length of strip footing is considerably greater than its width. A strip footing is also known as continuous footing.
Mat or Raft foundation:
It is a large slab supporting a number of columns and walls under an entire structure or a large part of the structure. It is used to cover the foundation of the whole building area.
Pile foundation:
A pile is basically a long cylinder of a strong material such as concrete that is pushed into the ground to act as steady support for structures built on top of it. It is also called a deep foundation. Depth of the pile is very much greater than that of its lateral dimension.
Confusion Point:
For pile foundation ⇒ Depth >>>>> Width
For strip footing ⇒ Length >> Width
∴ Strip Footing is the correct answer.