A user successfully login’s at 3:00 PM, What happens at 3:31 PM, if the Login hours for the user’s Profile are set from 7:30 AM to 3:30 PM?

A user successfully login’s at 3:00 PM, What happens at 3:31 PM, if the Login hours for the user’s Profile are set from 7:30 AM to 3:30 PM?
A . User is automatically Logged Out
B . User keeps working continuously without any issues
C . User is asked in a Popup window if he would like to extend his session
D . User is logged out once he tries to do any DML (Data Manipulation) Operation i.e. Save, Edit etc.

Answer: D