Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to hatch chicken eggs [title] Find out where to source fertile eggs. [step] Fertile eggs must be obtained from hatcheries or poultry farms which have roosters in their flock, if you do not breed your own chickens. You may be able to buy fresh farm eggs from someone who sells their extras.

Ending1: [substeps] Eggs raised by a chicken farmer, for example, have a highly fertile embryo that can provide eggs to chickens for their sale. The more fertile eggs you find, the better you can guarantee that they will hatch and produce eggs. Ending2: If that is not possible, you can purchase them from other farm animals of your choosing. [title] Place the coop near open water or wells. Ending3: Be sure to check with potential suppliers well in advance, to ensure they have the correct breed and number of eggs in stock. Your county extension agent or extension poultry specialist may be able to suggest a source. Ending4: [title] Collect eggs from your farm and hold any up to your bird's eye level. [step] This will ensure that your bird's eyes and ears are fertile and save them for breeding in general.

Answer format: ending1/ending2/ending3/ending4