Which software component sends notifications about print job statuses?

The correct choice is the print monitor. This component plays a crucial role in managing and providing information about print jobs. It acts as an intermediary between the print queue and the print driver, tracking the status of print jobs as they are sent to the printer. When a print job is put into the queue, the print monitor sends notifications regarding various states, such as whether the job is currently processing, completed, or if there is an error.

In contrast, the other choices serve different functions in the printing process. The print queue is responsible for storing print jobs until they are processed by the printer but does not actively send notifications about the status of those jobs. The print service facilitates communication between the operating system and the printer but does not provide status updates on print jobs. The print driver serves as the software that translates the data to be printed into a format that the printer understands, but like the print queue, it does not directly manage or communicate job statuses. Thus, the print monitor stands out as the component that specifically handles notifications about print job statuses.