Your print server has one printer spooler defined called printer1. You have a requirement to modify the shell script that actually sends the jobs associated with printer1 to the printer.
Which file should you modify?

A.
/etc/printers.conf

B.
/etc/lp/interfaces/printer1

C.
/var/spool/lp/requests/printer1

D.
/usr/lib/lp/postscript/postprint