Any place you 'tap' into electrical power can be an outlet, such as a receptacle, light, hardwired smoke detector, etc. Bedroom outlets must be AFCI protected. Closet lighting does not have to be AFCI protected, although often, closet lighting is on the same circuit as the bedroom circuit which would already have to be AFCI protected. Most of the time in my area in new construction, I see each bedroom having its own AFCI breaker.