Companycom is installing a p5 590 with a HMC to manage LPARs. The customer is very concerned about security and wants to restrict network traffic that is not necessary. What is necessary for communication between the LPARs and the HMC?（）

• A、An administrative VLAN with port 1808
• B、Port 657 which must remain open to TCP/IP and UDP traffic
• C、Network addresses are provided by DHCP services on the network
• D、DHCP on the HMC is required to be on to communicate between LPAR and HMC