Let `R` and `S` be two non-void relations on a set A. Which of the following statements is false?

The void relation on a set A is

The void relation on a set A is

The void relation on a set A is :

Let R_1 and R_2 be two relations defined on a non-empty set A. Which of the following statements is false? Give reason in support of your answer. If R_1 and R_2 are reflexive, then so is R_! Nn R_2 .