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The command used to define the authorization method for commands in AAA (Authentication, Authorization, and Accounting) is indeed "aaa authorization." This command is essential because it specifies how a device determines if a user has permission to execute specific commands after they have been authenticated.

In a Cisco networking environment, once a user is authenticated successfully, the authorization process kicks in to determine what level of access the user has based on their credentials. This is where "aaa authorization" comes into play, allowing the configuration of various methods for authorizing actions on the device, such as command authorization or group authorization.

The other options refer to different aspects of the AAA framework. For instance, "aaa authentication" is used to configure methods for user authentication, ensuring that only authorized users can log in. "aaa logging" pertains to monitoring and logging activities for auditing purposes, and "aaa credential" is not a standard command used in the context of AAA in Cisco IOS. Thus, the choice that correctly identifies the command to specify authorization methods is "aaa authorization."