Given below are the configuration changes done to set a hard limit for system resources:

Given below are the configuration changes done to set a hard limit for system resources:
1) Edit the limit.conf file in the /etc/security directory.
2) Edit the .bash_profile file.
3) Edit the login file in the /etc/pam.d directory.
4) Issue the ulimit command.
Identify the steps that are required.

A.
1, 2, 3, 4

B.
1 and 2; 3 and 4 not required

C.
1 and 3; 2 and 4 not required

D.
2 and 4; 1 and 3 not required