Which option correctly explains the main security purpose of full-disk encryption (FDE) or file-based encryption (FBE) on mobile devices?

• A.To stop one app reading the private data directory of another, a boundary the kernel maintains from the moment each package is installed on the handset
• B.To speed up storage reads, with the crypto engine doing work the filesystem would otherwise hand to the main application processor
• C.To protect data stored on the device if it is lost or stolen, making the data unreadable without the correct credentials/keys
• D.To encrypt data in flight over Wi-Fi, leaving the material on the flash chip readable by whoever removes that chip from the board