Yes, setting the " Source Mappings: Application Rule " configuration on the account attribute is necessary to meet the requirements described. The use case involves flagging privileged accounts based on attributes read from different applications and using these flags in various IdentityIQ features like Advanced Analytics, rule writing, and policy enforcement. By configuring the attribute with a source mapping that uses an Application Rule, you can implement complex logic to derive the attribute ' s value from multiple sources, such as a financial application and a keystore application, according to the specific requirements.

Therefore, the correct answer is A. Yes.