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Using Bluetooth to connect a wireless printer to two computers in different rooms is a valid option due to its capability for short-range wireless communication. Bluetooth technology enables devices to connect and exchange data over short distances without the need for physical cabling. While Bluetooth is often used for connecting peripherals like mice and keyboards, it can also be utilized for connecting printers, allowing them to be placed in one location while remaining accessible to computers situated in different rooms.

Wireless Ethernet, which involves connecting the printer to a Wi-Fi network, is another suitable option that enables devices to communicate over longer ranges, making it possible for multiple computers to access the printer simultaneously from various locations. However, since only one choice is provided as the answer, it's important to highlight that Bluetooth could work but has limitations compared to other options for networked printing.

On the other hand, USB and parallel ports require a direct connection to each device, making them impractical for connecting a printer wirelessly to multiple computers in different rooms, as they necessitate physical proximity. This distinction helps clarify why Bluetooth is seen as a valid method for this specific scenario.