Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to install custom firmware [title] Record the router's model and version number. [step] These numbers are usually located near the manufacturer's logo, underneath or in back of the router. Write down the model and version information for future use.

Ending1: [substeps] If you are using windows xp (default operating system), the model number can be found in the start menu under " system settings. " skip all the discussion menus, and then go to system preferences. Ending2: [title] Obtain the router's ip address and default gateway for your computer system. [substeps] Determine the ip address and default gateway for a pc. Ending3: [substeps] " w " with the green background is the serial number for the model. " p " with the red background means " unhappy operating system. Ending4: [substeps] It is easy to determine what operating system is running on your router if you don't know the model. Copy the model from the registry to convert it to your operating system.

Answer format: ending1/ending2/ending3/ending4