Exam 210-260 Question id=649 Secure Routing and Switching

What is a possible reason for the error message:
Router(config)#aaa server? % Unrecognized command

A. The command syntax requires a space after the word "server"
B. The command is invalid on the target device
C. The router is already running the latest operating system
D. The router is a new device on which the aaa new-model command must be applied before continuing
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