Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to operate a concrete compression machine [title] Before you even turn on the machine, make sure you have all of the materials you need in order make operating this machine and making calculations as easy as possible. Put on your safety goggles/glasses and your gloves before you proceed. [title] Draw a table on a piece of paper in order to record the readings off the display of the machine when the concrete specimen fails/cracks.

Ending1: [title] Using an arrow and marker, mark the position of the graph and then write down the readings. [step] Write down as many measurements or other information needed as needed from the sheet of paper. Ending2: [title] Get a set of wheels in the appropriate size. [step] You can use any type of wheels that are appropriate for the size of the specimen you are working with. Ending3: [step] When you've drawn this sheet, transfer it to the machine of your choice. [title] Now that you've drawn this sheet, attach it to your display. Ending4: Calculate the diameter and area of each concrete specimen and record. [title] After making a complete table, turn on the machine.

Answer format: ending1/ending2/ending3/ending4