Mark all packages required for PPPoE server on MikroTik RouterOS.

The correct choice for the packages required for a PPPoE server on MikroTik RouterOS is the PPP package. This is because the PPP (Point-to-Point Protocol) package is essential for establishing and managing the connections over the PPPoE (Point-to-Point Protocol over Ethernet) protocol. PPPoE is commonly used in broadband network connections to encapsulate PPP frames within Ethernet frames, allowing users to manage multiple sessions over a single Ethernet connection.

The PPP package provides the necessary functionalities for setting up the server, handling client requests, data link establishment, authentication, and session management that are integral to PPPoE operation. Without this package, the router would not be able to function as a PPPoE server.

The other options, while related to various functionalities within RouterOS, do not directly pertain to the core operation of a PPPoE server. The synchronous package is not specifically necessary for PPPoE, as PPP operates over a variety of media and does not require synchronous communication specifically. The RADIUS package assists in remote authentication, which is useful in user authentication scenarios, but it is not strictly necessary for the basic functionality of a PPPoE server. Similarly, the User Manager package is associated with managing user accounts and database