(1 point) Prove the following argument. Make sure you write the rule/law you applied at each step. q r + P rs S t ..t Type your answer in the answer box. Type v' for logical or, 'N' for logical and, '-' for logical not, '->' for implication. Preview your answer to make sure they render properly. Do NOT copy paste any of the special characters from the question, otherwise, they will render as ?? on our end. Upon completion, ask a TA or the instructor to check your solution off. If you complete after class, we will grade it later