Which of the following cannot be the number of reflexive relation defined on a set A?

If a set A contains n elements, then which of the following cannot be the number of reflexive relations on the set A?

Define an reflexive relation.

Define a reflexive relation.

Define a reflexive relation.

If n(A) = 3, then number of reflexive relations that can be defined on A is

If n(A)=4 ,then total number of reflexive relations that can be defined on the set A is

Let A be a set containing n elements. If the number of reflexive relations that can be defined on A is 64, then n is equal to