Which of the following cryptographic solutions is used to hide the fact that communication is occurring?

Steganography is the practice of concealing a message, image, or file within another message, image, or file. Its primary goal is to hide the very existence of communication, not just the content. For example, a secret message might be embedded within the pixels of an innocent-looking photograph. Data masking replaces sensitive data with realistic but false data to protect privacy, but the fact that data is being communicated or stored is not hidden. Tokenization replaces sensitive data with a non-sensitive equivalent (a token) to reduce risk, but again, the communication itself is not concealed. A private key is a component of asymmetric cryptography used for encryption or digital signatures; it protects the content of communication but does not hide that communication is taking place.