How to permanently change Ulimit Settings

Red Hat Enterprise Linux Server release 7.5

Please i need help on Redhat 7 server, how to permanently change these values ( open files = ulimit -n ); (user processes = ulimit -u );

(data segment size = ulimit -d ); ( default process data size = soft limit ) and (maximum process data size = hard limit ).

For example:
I want to set Data seg size at 1073741824 so after rebooting the server,
if i type # ulimit -d the result will be 1073741824