When ordering a new IBM Power Systems server, a customer is given the option of two types of Hardware Management Console:7042-CR4 and 7042-C06. Which main difference between the options would influence the customer's decision?（）

A. The 7042-CR4 is a rack mounted model, compared to the 7042-C06, which is adesktop.
B. The 7042-CR4 is limited to 16 managed systems, compared to a limit of 32 for the 7042-C06.
C. The 7042-C06 has faster CPUs and twice the RAM compared to the 7042-CR4,which is suited to large enterprise deployments.
D. The 7042-C06 can manage POWER5-based hardware, in addition to POWER6, while the 7042-CR4 can only manage POWER6-based hardware.