Multi-select problem: How does the next paragraph end?

How to hang sheet metal in your cabinets
Lay a straight edge on the bottom shelf of the cabinet.
Measure the inside surface of the cabinet, by first laying a straight-edge face flat on the bottom shelf of the cabinet with one end of the straight-edge sticking out of the cabinet a few inches.
Slowly close the cabinet door until it is lightly touching the straight-edge.

Possible answers:
A). After this, cut slits into the top and bottom to prevent sheet metal from sliding through cracks. Discard this gap, leaving the bottom shelf free and the inside " freestanding " part of the cabinet free..
B). Mark a pencil mark on the door where it touches the straight-edge. Move the straight-edge over at least a couple of inches and make a second mark..
C). Use a hammer to hammer around the edges to close the door. Mark the zipper holes on each inner lip of the cabinet..
D). Immediately knock down the cabinet if there is any excess shelves inside it. Measure and cut a strip of lightweight duct tape..
B).