How would you define the reminder alert?

You need to send an alert to the HR admin if an employee is sick for more than 15 days.

How would you define the reminder alert?
A . As a post save rule in the Time Type object definition
B. As a save rule in the Employee Time object definition
C. As a save rule in the Time Type object definition
D. As a post save rule in the Employee Time object definition

Answer: D