Clarissa needs to modify a runtime environment variable that will be set for all users on the system for both new logins as well as new instances of the BASH shell being launched. Which of the following files should she modify? a. /root/.profile
b. /etc/profile
c. /root/.bashrc
d. /etc/bashrc

Clarissa should modify the file /root/.profile.

Runtime environment variables

Therefore, in the context, Clarissa wishes to modify the run time environment variable which can be used for all the new logins and also for the new instances for the BASH shell. So for this, Clarissa should modify the /root/.profile file command.

Learn More :

Following are the description of the wrong choice:

Therefore, the "/root/.profile" file should be changed by Clarissa.

Learn More :  

a local network will allow everyone in the office to share the printer.

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

~