Final answer:
To display Open Firmware on older Macintosh computers, hold down Command-Option-O-F at startup or use a network connection with telnet if it's configured for remote access. F8 or the Apple key are not standard methods for accessing Open Firmware.
Step-by-step explanation:
The question relates to accessing Open Firmware, which is a type of firmware commonly used in PowerPC-based Apple computers before the transition to Intel processors. Open Firmware can be displayed in two ways on these systems: by using a keyboard shortcut or by using a network connection.
Option 2 is the correct one. To display Open Firmware on compatible Macintosh computers, you should restart the computer and immediately hold down the Command-Option-O-F keys until you see the white Open Firmware interface. Alternatively, you can access Open Firmware remotely through a network connection using telnet, but this requires the Open Firmware to be previously configured to accept remote connections.
The other options presented, such as F8 or the Apple key, are not standard methods to access Open Firmware.