Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to give your guinea pig a good, healthy diet [title] Select a good pellet. [step] Make sure the pellets you select have nutritional value. Plain pellets without any added seeds or colored treats should be selected.

Ending1: For the most accurate results, choose pellets that are water-soluble but free of microorganisms. [substeps] Those with a good balance of nutritional value and nutrients should have pellets that will last a few months. Ending2: This ensures that your guinea pig will be eating the nutrients it requires without all the sugar and dangerous bits and pieces inside. [substeps] Use alfalfa based pellets for guinea pigs under 6 month old and timothy based pellets for older guinea pigs. Ending3: Healthy pellets may result in lower fiber levels and fewer fevers. Popular pellets to select for your guinea pig include : [substeps] Sheep pellets; sunflower seed; sesame seeds; and flax seeds. Ending4: Any pellets that are too small would be too high in calories and cause too much weight gain. [substeps] Rabbits can be picky eaters so make sure to give the pellets your rabbit is not fond of.

Answer format: ending1/ending2/ending3/ending4