[Solved] A _____ is an information system that enables users to retrieve data from the Web by using keywords related to their topic of interest. A)Web server B)data mart C)search engine D)data warehouse Conditioned Response: A learned reaction to a previously neutral stimulus that results from repeated exposure to a stimulus paired with a response. Nude Female's Picture: An image depicting a woman without clothes, often considered in contexts ranging from art and photography to issues of privacy and consent. Increased Heartbeat: A physiological response where the heart rate speeds up, which can occur due to various factors such as exercise, stress, or fear. Variable-Interval Schedule: is a type of reinforcement schedule in which responses are rewarded after unpredictable time intervals, leading to consistent and stable response rates over time.