Question: Which technique ( cryptography or steganography ) is used in each of the following cases for confidentiality? A . To send a message, a spy

Which technique (cryptography or steganography) is used in each of the following cases for confidentiality?
A. To send a message, a spy replaces each character in the message with a symbol that was agreed upon in advance as the characters replacement.
B. A company uses special ink on its checks to prevent forgeries.

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