What could be done to make the new alias persistent only for smith?

A new user smith wants to customize the bourne shell by creating a new alias for the ls -l
command. He wants to make the new alias persistent across logouts and also reboots. What
could be done to make the new alias persistent only for smith?

A.
Add the new alias to ~/.bashrc.

B.
Add the new alias to ~/.profile.

C.
Add the new alias to /etc/profile.

D.
Add the new alias to ~/bash_profile.

Explanation: