What Actions Can a Student Take to Manage the Phone

What actions can a student take to manage the phone calls received throughout the day?

A) Set a specific time during the day for business or school related phone calls.
B) Allow phones call at any time as long as they are short.
C) If the student needs to leave a message,state that he/she can be contacted any time.
D) Keep the phone turned off until all studying is completed for the day.