What is the most important defensive barrier for information security, protecting information systems and data?

Question $2$Select one:

A$.$

The use of Biometrics and $2-$step authentication

B$.$

Installing Anti$-$Virus and Malware protection

C$.$

Strong Firewalls

D$.$

Strong Authentication, complex password, and use of RSA and Dou mobile identification devices

E$.$

Employees $($People$)$ always following the correct information security procedures