Final answer:
The queuing system when buying a ticket for a college football game at multiple windows is a multichannel, single-phase system, providing several channels for the same single-phase service efficiently.
Step-by-step explanation:
When buying a ticket for a college football game where there are multiple windows for the transaction, the queuing system line structure is a multichannel, single-phase system. This is because there are several channels (ticket windows) where the service (ticket purchasing) occurs, but each channel provides the same type of service in a single phase. This type of queue minimizes wait times and tends to be efficient, especially during peak times before a game when many fans are trying to purchase tickets.