Complete the following sentence: As the data moves down through the layers of the OSI reference model, before passing it down to a lower layer, each OSI layer _____________________.

Complete the following sentence: As the data moves down through the layers of the OSI reference model, before passing it down to a lower layer, each OSI layer _____________________.
A . adds a header and (if applicable) a trailer
B . adds a header after stripping the header added by the previous layer
C . adds both a header and a trailer
D . adds only a header

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Answer: A