Final answer:
The most reliable way to prevent new print jobs during repairs is to pause the print queue, as this allows for a seamless resumption of printing services after repairs without affecting network configurations.
Step-by-step explanation:
To address the problem with the network printer, the most reliable way to prevent print jobs from being added to the queue while the printer is being repaired is option (c) Pause the print queue. Pausing the print queue allows the network administrator to halt new jobs from being processed without disrupting the entire network setup. This action can typically be done via the printer's software interface or through the print server management console. It does not affect the existing network configuration or printer installation, and users can resume printing seamlessly once the printer is back online and the queue is resumed.