I can't answer without the choices, please put the choices so I can help you.
The answer is D. Hope that helps!
The protocols that would secure a tunnel for credential exchange using port 636 is Lightweight Directory Access Protocol Secure (LDAPS).
What is LDAPS?
Lightweight Directory Access Protocol Secure (LDAPS) is known to be a protocol that uses a PKI certificate to be able to secure LDAP connections over the network and it often uses TCP port 636.
Hence, The protocols that would secure a tunnel for credential exchange using port 636 is Lightweight Directory Access Protocol Secure (LDAPS).
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Answer: The answer is C- replacing the outdated terms with slang
independence
in the sense that it should be free from external interference