Henry uploaded the photos of his birthday to a cloud storage system. He feels that it’s a safe option for data storage. His friend suggested that there may be a disadvantage to cloud storage. Which disadvantage is Henry’s friend referring to?
A. The owner may not be able to delete the data after the upload.
B. The file format of the images may be corrupted.
C. The service can sell the data without notifying the owner.
D. People can alter the data without notifying the owner.
E. The data is not under the owner’s direct control.