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Data appended to, or a cryptographic transformation of, a data unit that allows a recipient of the data unit to prove the source and integrity of the data unit and protect against forgery is a(n) ___________ .

A) security audit trail B) digital signature C) encipherment D) authentication exchange

? ?A _____, such as that illustrated in the given figure, consists of rectangles that represent program modules, with arrows and other symbols that provide additional information.?

A. ?flowchart B. ?data module C. ?structure chart D. ?subordinate module