Disable Ctrl+Alt+Del in Linux

A.

The correct answer is A. /etc/inittab.

The file /etc/inittab is the configuration file for the initialization process of Linux, which defines the default runlevel, services to be started, and actions to be taken when a particular event occurs. The Ctrl+Alt+Del key combination is one such event, which by default is configured to initiate a system reboot. However, it can be disabled by modifying the /etc/inittab file.

Here are the steps to disable Ctrl+Alt+Del in Linux:

1. Open the /etc/inittab file using a text editor such as vi or nano.

bashCopy code
sudo vi /etc/inittab 

2. Look for the line that starts with "ca::ctrlaltdel" and comment it out by adding a '#' symbol at the beginning of the line.

javascriptCopy code
#ca::ctrlaltdel:/sbin/shutdown -t3 -r now 

3. Save the changes and exit the text editor.

4. Reboot the system or restart the init process for the changes to take effect.

csharpCopy code
sudo init q 

After disabling Ctrl+Alt+Del, you can still reboot the system using the "shutdown" command or the "reboot" command, but not by pressing the Ctrl+Alt+Del key combination.

The other options provided in the question are incorrect:

• B. ~/.bash_profile: This file contains user-specific settings for the Bash shell and does not control system-wide events such as Ctrl+Alt+Del.
• C. /etc/securetty: This file contains a list of TTY devices that are considered secure for user login, and does not control system-wide events such as Ctrl+Alt+Del.
• D. /etc/security/limits.conf: This file is used to set resource limits for user processes and does not control system-wide events such as Ctrl+Alt+Del.