6. Indicate if each proposition below is a tautology, a contradiction, or a conmtingency 13 ps tautology.a A. A well-formed formula (wft) is a B. A wff a C. A wff is a leatianaifitstruth table values areall sa Luntialictian ifits tnuth table values are allE Questions: (Questions 7-9 have more than one correct answer. Cirele the correet response 7. We define the following propositions as: 13 pts) G:I like grape juice E:Grape juice is expensive B: I will buy grape juice. Consider the sentence: "If I don't like grape juice and it is expensive, I will not buy grape juice" Circle the correct propositions below that provide logical equivalent to the above sentence A. (GV-E) B B. B (G v-E) C. -BV(GAE) D. -BA(GAE) E. GAE)--B