Which of the following are common elements that act as indicators in user interfaces?

In user interfaces, common elements that serve as indicators are crucial for providing users with information about the state of the system and guiding their interactions. Buttons, sliders, gauges, and status lights directly represent user actions or system status, making them vital for user engagement and feedback.

Buttons allow users to perform actions, while sliders help adjust settings like volume or brightness, providing immediate results visually or audibly. Gauges often display performance metrics or other vital statistics, such as speed or temperature, allowing users to quickly assess levels without needing text explanations. Status lights serve as immediate indicators of device states (e.g., power on/off, alerts), visually signaling to users what the status of the system is with simple color codes.

The other options include elements that can contribute to the overall user experience, such as graphs and charts for data visualization or audio alerts for notifications, but they do not specifically fall under the category of basic interactive indicators within user interfaces.