Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to calculate board feet [title] Measure the length, width, and depth in inches. [step] Use a stiff tape measure to measure the length, width, and depth of the board. Each measurement should be taken separately and recorded in inches.

Ending1: [title] Sit on the edge of your chair. [step] The chair needs to be half submerged if you are starting on a flat surface such as a picnic table. Ending2: At the end of each measurement, pull the tape measure outward and record its average size in inches. [substeps] Calculate the length from top to bottom and around by subtracting it from the width of the board itself. Ending3: [substeps] Using this method of calculation, you must know the length, width, and depth of each board in inches. Round fractional sizes to the nearest quarter-inch. Ending4: In the years before board feet were much more common, this measurement would not exist. [substeps] Even if you are measuring a different piece, simply measure from one end of the board to the other.

Answer format: ending1/ending2/ending3/ending4