Final answer:
For a macOS user, the recommended option for joining a MS Teams meeting is generally the desktop app for its full range of features. The web app is a good alternative if software installation is not desired, and the mobile app is suitable for on-the-go usage. Ultimately, all options will enable joining the meeting.
Step-by-step explanation:
When a macOS user is joining a MS Teams meeting, the best option for joining will largely depend on personal preference and the specific features they require. However, it is generally recommended to use the desktop app (option a) if available, as it may offer the most comprehensive set of features, including the full range of meeting capabilities, notifications, and potentially better integration with the operating system for things like calendar and contacts. Using the web app (option b) can also be a good choice, especially if the user does not want to install any software or is using a computer where they cannot install applications. The mobile app (option c) is handy for users on the go, but it may not provide as robust an experience as the desktop or web versions. Ultimately, it doesn't matter significantly which one they use (option d), as all options will allow them to join the meeting, but for the best experience, the desktop app is often preferred.