Based on the above demand, which of the following networking scheme is more appropriate?

The requirements of a bank operations backend storage system are as follows:

(1) Business image file size which operations system produces is about 100KB;

(2) Service operation System is all GE business networking, server and terminal are GE interfaces, upgrade to 10GE according to business needs;

(3) Only requires 72TB of total space, the latter expansion has the priority to expand disk;

(4) Room only have 20U rack space to store the current period storage device, priority to consider configuring 3 nodes + supporting switches to meet room cabinets Planning.

Based on the above demand, which of the following networking scheme is more appropriate?
A . scheme 1:
1 * OceanStor 9000 C Node
36 * 2TB SATA configuration;
2 * front end of GE + 2 * the rear end of 10GE
B . scheme 2:
3 * OceanStor 9000 C Node;
36 * 2TB SATA hard disk;
2 * front end of GE + 2 * the rear end of 10GE
C . scheme 3:
3 * OceanStor 9000 P Node;
36 * 2TB SAS hard disk;
2 * front end of GE + 2 * the rear end of 10GE
D . scheme 4:
3 * OceanStor 9000 M Node;
36 * 2TB SATA hard disk;
2 * front end of GE + 2 * the rear end of 10GE