The recommended configurations for securing an application with Azure AD B2C include implementing Multi-Factor Authentication (MFA) and defining user roles.
MFA significantly enhances security by requiring users to provide two or more verification methods before being granted access to the application. This could involve a combination of passwords, mobile device notifications, or biometric factors. By enforcing MFA, the risk of unauthorized access due to compromised credentials is greatly reduced, thereby adding an essential layer of security to the user authentication process.
In addition to MFA, establishing user roles helps to manage permissions and access levels within the application effectively. By assigning specific roles to users, organizations can ensure that users have the minimum necessary permissions required to perform their functions. This principle of least privilege minimizes the risk of accidental or malicious actions that could compromise the security of the application.
The other options, while beneficial in various contexts, do not specifically address the unique security needs of applications reliant on Azure AD B2C. Application Insights and Azure Policy are more geared toward monitoring and compliance rather than direct user authentication security. Similarly, Network Security Groups and Azure Firewall focus on network access controls rather than on identity management and authentication directly, which are the core considerations in Azure AD B2C environments.