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【单选题】
What is the MD5 algorithm used for?()
A.
takes a fixed-length message and produces a 128-bit message digest
B.
takes a variable-length message and produces a 168-bit message digest
C.
takes a message less than 2^64 bits as input and produces a 160-bit message digest
D.
takes a variable-length message and produces a 128-bit message digest ActualTests.com
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