Emily gets paid to recruit people to join an email list at work. If she signs up 5 friends and they all sign up 5 more friends, the function y = 5x represents the number of people on the email list after so many cycles. Select all the key features that apply to y = 5x. The domain is all real numbers. The relevant domain is all nonnegative integers. The domain and relevant domain are both {x ≥ 0}. The range is all real numbers. The y-intercept is 1. The y-intercept is 5. As x increases, y increases; and, as x decreases, y approaches 0.