In OpenStack, Keystone supports multiple authentication methods. Which of the following operations can enable OpenStack to use different authentication methods to meet different security requirements?

In OpenStack, Keystone supports multiple authentication methods. Which of the following operations can enable OpenStack to use different authentication methods to meet different security requirements?
A . Create different projects and configure multiple authentication methods by modifying the configuration files
B . Create different roles and configure multiple authentication methods by modifying the configuration files
C . Create different domains and configure multiple authentication methods by modifying the configuration files
D . Create different user groups and configure multiple authentication methods by modifying the configuration files

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Answer: C