The IBM Watson Natural Language Understanding service's Entities API is designed to detect various entities within text, such as names of persons, places, organizations, cities, and geographic features. While it can extract entities and understand their types, it does not detect a person's gender based on their picture, nor does it specifically focus on relationships or co-references between entities, which are typically handled by more advanced natural language processing tasks. Therefore, the two correct options are names of persons, places, and organizations, and cities and geographic features.