Definition: You are given a question on formal logic. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: 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.)
I ≡ ~J
I ∨ J / I
(A)Valid (B)Invalid. Counterexample when I and J are true (C)Invalid. Counterexample when I is true and J is false (D)Invalid. Counterexample when J is true and I is false

D