What command with all options and/or parameters will send the signal USR1 to any executing process of program apache2?

What command with all options and/or parameters will send the signal USR1 to any executing
process of program apache2?

Answer: KILLALL-SSIGUSR1APACHE2,KILLALL-SUSR1APACHE2,KILLALLSIGUSR1APACHE2,KILLALL-USR1APACHE2