Using Venn diagrams, determine whether the arguments below are valid or invalid. (a) All professional athletes are rich. All rock stars are rich. Therefore, some rock stars are professional athletes. valid? invalid?
(b) All bunnies are skittish. Some skittish animals have fur. All cows have fur. Therefore, cows are skittish animals. O valid O invalid
(C) All squares are rectangles. Some quadrilaterals are squares. Therefore, some quadrilaterals are rectangles. O valid o O invalid
d) All rectangles are quadrilaterals. All quadrilaterals are polygons. Therefore, all rectangles are polygons. O valid O invalid​