Once macbeth agrees to murder the king, he and lady macbeth plan that: a. lady macbeth will make sure the guards are drugged, allowing macbeth to sneak in and stab the king to death. b. macbeth will invite the king to have a drink with him, then drop poison into the king's cup. c. lady macbeth will ask the king to visit her chamber, where macbeth will be waiting to stab him to death. d. macbeth will drug the guards while lady macbeth steals the guard's dagger and stabs the king with it.