单项选择题

Which of these is the best way to provide sender non-repudiation？（）

A. pre-sharedkey
B. secure hash
C. SSL
D. RSA signature

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单项选择题

A. group 3
B. group 1
C. group 5
D. group 7

单项选择题

A. 4 bytes for both
B. 4 bytes， and 8 bytes respectively
C. 8 bytes for both
D. 24 bytes for both