OP, you mentioned 3/4" holes (which won't fit a PC cord but will fit armored cable (AC/MC). And you mentioned armored, so I assume this is in-wall wiring which is proceeding through built-in style cabinets.
Now OP, no prejudice to your job. Given that you make a point to ask, that is plain evidence that you care and aim to do the work tip-top.
However, many other people with similar questions find our Q&A on Google, and for their sake, let me borrow the megaphone and steer them away from the most common mistake in this area.
Honestly, most cabinet installers get this wrong.
Every junction box must have a cover.
Every junction box cover must remain accessible without tools or disassembly of the building or damage to finish materials. NEC 314.29 and others.
So what happens a lot is people install built-in cabinets and "bury" the electrical junction boxes, so that they cannot be accessed without entirely emptying out the cabinetry and then disassembling the built-in cabinets.
That's not allowed. There must be an access panel, removable without tools, that grants access to the original junction box that is being buried or tapped.
Another way of doing that, if the installer is sharp, is line up the structure of the cabinets so one can put an extension box on top of the 1-gang in-wall box, so the extension pops through the cabinetry. From there it is permissible to bring metal flex conduit into the side ports of the extension (either behind the cabinetry or in front of/visibly inside it perhaps off an extension on the extension... your call) and go onward to points of ones choosing. Of course this isn't easy to make aesthetic.