The First Known Examples of the Practice of Concealing a Message

The first known examples of the practice of concealing a message within a message comes from the historian Herodotus,who wrote of a case in which a message was tattooed on the shaved head of a slave.When the slave's hair grew back,he traveled to the recipient and delivered the message by having his head shaved again.Modern applications involve concealing data within computer files.This practice is referred to as

A) latenography.
B) obfuscography.
C) cryptography.
D) steganography.