Mrs. Harwell's students are divided into three lunch groups, as shown in the table. Student Lunch Group Micah: early Holly: middle Taylor: early Riley: late Mariah: late If A is the rule that assigns each student in the table to a lunch group, then rule A (is or is not) a function. If B is the rule that assigns each lunch group in the table to a student, then rule B (is or is not) a function.