An animal sanctuary houses a variety of animals. To understand the workload of the sanctuary's veterinarians, the director looked at which types of animals are treated or not treated by various doctors. The Venn diagram shows this information for three of the doctors. All animals housed (a) Select all the doctors who do not treat quails. Treated by Treated by Dr. Chen Dr. Hughes Dr. Chen )Dr. Hughes ) Dr. Peterson Mice Dogs Cats (b) How many types of animals are treated only by Dr. Peterson? Birds (c) Which types of animals are treated by neither Dr. Chen nor Dr. Hughes nor Dr. Peterson? Choose all that apply. Birds Cats Dogs Elks Frogs Quails Turtles Rabbits Koalas ( Horses Iguanas O Koalas O Mice O Otters Pigs Quails O Rabbits O Turtles O Zebras Elks Iguanas Otters Treated by Horses Dr. Peterson Zebras Pigs