If you aren't sure which one you're dealing with, you should feel free to plug into any or all of them to suit your power requirements.
Ọ bụrụ na ị maghị onye ị na-emeso, ị ga-enwere onwe gị ịbanye na nke ọ bụla ma ọ bụ ha niile iji kwekọọ na ịchọrọ ike gị.