Which of the following is designed to guarantee that once data is written it cannot be modified？（）

A. Multiple types of network cards were used.
B. The environment is outside of the DMZ.
C. Hardware used is not on the HCL.
D. Internal hard drives were used for storage instead of external hard drives.

A.Manufacturer’s specifications
B.Organizational impact
C.Vendor lists
D.Compatibility requirements

A.RAID0
B.RAID1
C.RAID3
D.RAID5