In the show | compare rollback 49 command, what is the purpose of the | ?

In the show | compare rollback 49 command, what is the purpose of the | ?

A. The|is used to represent an "either or" statement B. The|is a shortcut to redirect output from a command line to a file C. The|filters the output of the show command D. The|changes the command from an operational command to a configuration mode command