Which of the following source ports is MOST likely to be used by a client when making an outbound TCP connection to a windows server?

Port 80 is the well-known destination port for HTTP servers; it is not used as a client source port for outbound connections.

Port 445 is the well-known server-side port for SMB (Windows file sharing); it is a destination port, not a client source port.

When a client initiates an outbound TCP connection, the OS assigns an ephemeral source port typically in the range 1024-65535. Port 3000 is the only option in this dynamic range, making it the most likely client-assigned source port for an outbound connection.

Port 3389 is the well-known server-side port for RDP (Remote Desktop Protocol); it is a destination port assigned to the server, not a client source port.