12. The results of a survey of 48 children indicate that 20 have a dog, 16 have a cat, and 19 have neither a cat nor a dog. II III IV a. Label each set in the above diagram with the appropriate set label. (up to 2 points) b. Fill in all four regions with the correct values. (up to 2 points) c. How many of those surveyed have both a cat and a dog? (up to 1