A cluster administrator has been asked to install HACMP on two nodes with the following  hardware：   -two CPUs， - 1GB RAM， - one 1 36GB drive， -two 10/100/1000 Ethernet adapters， and -GB Fibre Channel adapters dual attached to SAN storage.  In order to eliminate single points of failure，the administrator should first add which of the following：（）   

• A、 an additional 1GB RAM to each node.
• B、 Another bootable mirrored disk drive.
• C、 A 10/100/1000 GB Ethernet adapter to be attached to a redundant switch.
• D、 Nothing，because this is a viable cluster solution with no single points of failure.