The correct answer is C. Encryption.
Encryption is the process of converting data into a form that cannot be easily understood by unauthorized people. This is done by using a mathematical algorithm to scramble the data. The encrypted data can only be decrypted by someone who knows the encryption key.
Barcodes are a type of optical machine-readable code that represents data in a visual format. A barcode is a series of parallel lines of varying widths and spacings that are used to represent data. Barcodes are often used to identify products in retail stores.
Decoders are devices that convert encoded data into a readable format. Decoders are often used to decode barcodes.
Mnemonics are memory aids that help people remember information. Mnemonics can be in the form of acronyms, rhymes, or images.
None of the above options are the coding of data so that it can’t be easily understood if intercepted.