Huawei OceanStor 9000 Uses the Erasure Code Technology to Protect

Huawei OceanStor 9000 uses the erasure code technology to protect data. A site has seven nodes, and the customer requires the disk utilization rate to reach 70%. Which redundancy levels can be used to meet the requirement? (Choose all that apply.)

A) 6+1
B) 4+2
C) 6+4
D) 12+2:1