Construct a complete truth table for the following argument. Then, using the truth table, determine whether the argument is valid or invalid. If the argument is invalid, choose an option which presents a counterexample. (There may be other counterexamples as well.)
~K ≡ L / (K · L) ∨ (K · ~L)
(A)Valid (B)Invalid. Counterexample when K and L are true (C)Invalid. Counterexample when K is true and L is false (D)Invalid. Counterexample when L is true and K is false
D