A user is configuring a new SOHO Wi-Fi router for the first time. Which of the following settings should the user change FIRST?

While encryption is vital for securing wireless traffic, it is less critical than securing access to the router's configuration itself, which default passwords compromise.

Changing the Wi-Fi channel optimizes network performance and reduces interference but does not address the fundamental security risk posed by default router credentials.

Default usernames and passwords on new routers are publicly known and represent a significant security vulnerability if not changed. Modifying these credentials immediately upon initial setup is the most crucial first step to prevent unauthorized access to the router's administration interface.

Modifying the Service Set Identifier (SSID) customizes the network name, which is a convenience feature and does not address the immediate security vulnerability of default passwords.