Which gate on the list is considered functionally complete w

Which gate on the list is considered \"functionally complete\", which means that you can construct a NOT gate, an AND gate and an OR gate using a combination of only this particular gate? AND OR NAND None of the gates listed

A set of Boolean functions is functionally complete, if all other Boolean functions can be constructed from this set and a set of input variables are provided.

Therefore AND, OR, NOT gates are functionally complete.