Who may enter a street that has this sign?

This sign combination indicates a "bicycle street" ("Fahrradstraße") with the supplementary sign "Anlieger frei," which means "residents and persons with a legitimate reason, such as visitors or deliveries, are allowed." Cyclists are always permitted because it is a bicycle street. In this context, all persons visiting residents are also allowed to enter. However, moped riders are not allowed unless explicitly stated by an additional sign. You correctly selected answers 1 and 2, which matches the traffic rule. In the future, remember: in a Fahrradstraße with "Anlieger frei," only cyclists and legitimate visitors (not mopeds by default) are permitted entry.