Which statement is accurate regarding a student serving an internship in a practice?

a$.$ Students who are employed for $90$ days or less are considered full$-$time employees.

b$.$ Students should be given little hands$-$on experience to avoid liability issues.

c$.$ A student serving an internship should be reviewed on a regular basis in cooperation with his or her college supervisor.

d$.$ A student serving an internship may not become a future employee of the practice.