The following parameters are given for a computer science program:

$-$ Annual enrollment: $800$ students

$-$ Requirements: $140$ credits in the computer science program

$-$ Two summer semesters each year and the program spans for four

years

How many instructors should be allocated to maintain the class sizes of

fewer than or equal to $90$ students?

a$)12$

b$)18$

c$)18-24$

d$)$ More than $24$