Imagine you are writing a classroom management program. In which of the following scenarios will dynamic data structures approach make your program more efficient?

a classroom with a MAX of 24 students, being assigned 24 students

a classroom with a MAX of 24 students, being assigned 15 students

a school building with a MAX of 50 classrooms being assigned 30 classes

a school building with a MAX of 50 classrooms being assigned 50 classes

both b) and c)