Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to cut beef [title] Purchase a cut of beef. [step] Beef can be purchased at a butcher's shop or grocery store. For the sake of learning proper cutting, you should buy a cut with visible muscle, or " grain ".

Ending1: Beef can be cut in segments to help improve nutritional value, or it can be served in chunks. Cutting beef in chunks helps to work the muscle fibers in the meat and promotes a more expanded, but still durable, shape. Ending2: The beef you use should depend on the meal you're preparing. [substeps] " grain " refers to the direction of the major muscle fibers on a cut of meat. Ending3: Beef needs to be kept warm to prevent burning, which strengthens the bones and immune system. [title] Trim the beef at the time of cutting. Ending4: [title] Decide on the thickness of your beef. [step] Beef may be thicker than beef that is approximately 15 inches (45.7 cm) thick, but thicker beef does not require as much muscle.

Answer format: ending1/ending2/ending3/ending4