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.)
D ⊃ (~E ⊃ F)
~D ⊃ E
~E / F
(A)Valid (B)Invalid. Counterexample when D and E are true and F is false (C)Invalid. Counterexample when D is true and E and F are false (D)Invalid. Counterexample when E is true and D and F are false
A