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？（）
- ARedundant power supplies on the servers
- BRedundant PDUs in the rack
- Cedundant power supplies in the servers and redundant PDUs in the rack
- DRedundant power supplies in the servers， redundant PDUs in the rack， and Active Energy Manager （AEM）