For the following items， which management topology keeps management traffic isolated from ActualTests.comproduction traffic？（）

A.They use the same key for encryption and decryption of data.
B.They use different keys for decryption but the same key for encryption of data.
C.They use different keys for encryption and decryption of data.
D.They use the same key for decryption but different keys for encryption of data.

A.pre-shared key
B.integrity check value
C.XAUTH
D.Diffie-Hellman Nonce