9. Which of the following statements defines a C string? 10'}; a. char message [] = {'W', 'e', 'l', 'c', 'o', 'm', 'e', ''}; b. char message [] = {'W', 'e', 'l', 'C', 'o', 'm', 'e', 'P', c. char message [] = 'Welcome!'; d. char message [] = 'Welcome!\0