What is one of the steps involved in setting a default domain if a prior domain setting fails?

Setting a default domain when a prior domain setting fails typically involves configuring the application to handle domain-related issues effectively. Adding a Business Rule is a critical step in this process as it allows the configuration of specific conditions and actions within the system. Business Rules can be utilized to define the logic that should be applied when certain conditions are met, such as the failure of a prior domain setting. This enables the system to react appropriately, potentially designating a new default domain or implementing a fallback mechanism.

The other options, while they may seem relevant, don't directly address how to establish a default domain in response to the failure of a prior setting. Deleting the existing domain could lead to further complications and is not a necessary step in this context. Notifying the administrator is important for communication but does not directly resolve the issue at hand. Creating a new user role does not pertain to the domain settings and would not affect the default domain configuration. Thus, adding a Business Rule is a proactive and strategic approach to manage domain settings effectively.