Which of the following provides a mechanism that allows an end-user to use a single sign-on (SSO) for multiple services?

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Which of the following provides a mechanism that allows an end-user to use a single sign-on (SSO) for multiple services?
A . The Open ID Federation.
B. PCI Data Security Standards Council
C. International Organization for Standardization.
D. Personal Information Protection and Electronic Documents Act.

Answer: A