In Huawei OceanStor 9000, using Erasure code technology to protect the data. If there are seven nodes for a game point, and the customer wants the disk utilization to reach at least 70%, then what are the redundancy protection levels that can be used? (Multiple Choice)
A . 6+1
B . 4+2
C . 6+4
D . 12+2:1
Answer: AD