Which of the following statements about MD5 Routing Updates authentication is valid？ （）
A. The MD5 algorithm inputs the routing updates of arbitrary length and outputs a 128-bit hash
B. The MD5 algorithm inputs the routing updates of every 64bit length and outputs an 8-bit hash
C. Multiple keys are supported
D. Routing updates packets are delivered in encrypted messages
E. Shared secret keys are delivered in encrypted message
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