Correct Answer: C, EThe attack described involves the brute forcing of a PIN, which is a method commonly associated with Wi-Fi Protected Setup (WPS). WPS is known to be vulnerable to brute force attacks due to its reliance on an 8-digit PIN, making it susceptible to such exploits. Additionally, the attacker was able to modify the DNS settings on the router. This level of access suggests that the router's administrative credentials were likely left at their default settings, which is a common security oversight. Therefore, the most likely configurations that allowed the attack are the use of default login credentials and having WPS enabled.