When using the TRIM command, which do you select first?

Thanks for the invite

the answer 

select

the cutting edges

Answer is: option ( A ) The cutting edges

The ans is select the cutting edges

The cutting edge to be selected first in order to use Trim command

Thanks for the invite. Sorry, the question is out of my field.

(B) THE OBJECT TO BE TRIMMED SHOULD BE SELECTED FIRST

its optical

A) The cutting edges

when we use the TRIM command we select firts  : A) The cutting edges

You select the cutting edges first and then the objects to be trimmed