What are the advantages of performing encryption at the

Question

What are the advantages of performing encryption at the disk-block level, below the file system? (Mark all that apply.)

Note: Make sure you select all of the correct options-there may be more than one!

1. Avoiding file system overheads allows for higher performance
2. Since the encryption system has to deal with a simpler interface, the design is simpler
3. The same encryption system will work with different file systems
4. Encrypting at the disk-block level ensures integrity, which cannot be achieved in the file system itself