What item should an Architect consider when designing a Delegated Authentication implementation?

What item should an Architect consider when designing a Delegated Authentication implementation?
A . The Web service should be secured with TLS using Salesforce trusted certificates.
B. The Web service should be able to accept one to four input method parameters.
C. The web service should use the Salesforce Federation ID to identify the user.
D. The Webservice should implement a custom password decryption method.

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Answer: A