单项选择题

A customer has requested five rack mounted servers， and a rack. They want redundant power connections. Which of the following is required to meet these requirements？（）

A.Redundant power supplies on the servers
B.Redundant PDUs in the rack
C.edundant power supplies in the servers and redundant PDUs in the rack
D.Redundant power supplies in the servers， redundant PDUs in the rack， and Active Energy Manager （AEM）

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