Please, I want short answer because I have already answer but I want to make sure.

Q1. Which security mechanisms are provided in each of the following cases

a).A school demands student identification and a password to let student log in to school server

b).A school server disconnects a student if she is logged into the system for more than two hours.

c).A professor refuse to send students grade by email unless they provide student identification they were preassigned by the professor.

d).A bank required the customers signature for a withdrawal