Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to determine the sex of a cat [title] Approach the cat or kitten with care. [step] To ascertain the sex of a cat or kitten, it's necessary to pick the cat up. Some cats don't like to be handled, so take a little time to let him or her get comfortable around you.

Ending1: The more comfortable you are petting him or her, the smoother your visit will be. [title] Perform a belly-rub or exam. Ending2: You can use a string or cloth around a cat's neck. If the cat seems distressed or hesitant to be picked up, the cat may have a uterus issue. Ending3: [substeps] Stand or crouch near the cat and let him or her approach you. When the cat comes close, let him or her sniff your hand. Ending4: Other cats do not want to be stroked, but may favor human touch on the head as well. You should do some gentle petting and to be confident that the cat is comfortable and don't display any bodily kinks during handling.

Answer format: ending1/ending2/ending3/ending4