A customer is buying 10 new Power 720 servers and will integrate them into their existing data center which also has two Power 595s and five Power 750s, taking the total number of systems to 17. All currently installed systems are managed by a single HMC.All the machines will have dual VIO Servers for redundancy, and 10 client LPARs. How can they manage the new machines for the least cost?（）

A. Purchase a second HMC and use this to manage the new servers.
B. Connect all of the new servers to the existing private HMC network.
Configure a second private network on their existing HMC for the new servers.
D. Connect 9 of the new servers to the existing HMC and use Integrated Virtualization Manager on the 10th.