Which of the following are correct statements? Select all that apply.

Group of answer choices

The resolvent of p and $$p is $.$

Let C$1,$ C$2$ be clauses. The set of clauses $\{$C$1,$ C$2,$ T$\}$ and $\{$C$1,$ C$2\}$ are logically equivalent.

A set of clauses is valid if and only if every clause in the set is true in every interpretation

The empty set of clauses is unsatisfiable.