What type of software are collaborative teams likely using when they share documents and communicate online?

The correct choice is C, as groupware refers specifically to software designed to facilitate collaboration among teams, enabling them to share documents and communicate effectively online. Groupware encompasses various tools and applications that allow multiple users to work together on shared tasks, manage projects, and communicate in real time or asynchronously. This type of software typically includes features such as file sharing, messaging, video conferencing, and collaborative editing, which are essential for efficient teamwork in a digital environment.

Other options do serve specific purposes but do not directly cater to the collaborative needs of teams in the way groupware does. Operating systems manage computer hardware and provide a platform for running software applications but do not inherently facilitate team collaboration. Database management systems focus on storing and retrieving data and are not primarily designed for teamwork; they usually serve a backend role. Graphics design software is oriented towards creating visual content and does not usually include built-in features for document sharing and team communication.