Q$4.$ Indicates whether the below mechanisms$/$methods are used for protection or security reasons:

Installing an Anti$-$virus software

Setting up a password for each user of a system

Using Linux change mode "chmod" command to change the read$/$write$/$execute privileges of different users $($if you are not familiar with chmod command google it to learn more!$)$

Using a two$-$step verification, which is a mechanism that includes two authentication methods. For example a password and then a verification code sent to your phone to verify your identity.