Company XYZ provides residential television cable service across a large region.

The company’s board of directors is in the process of approving a deal with the following three
companies:
A National landline telephone provider
A Regional wireless telephone provider
An international Internet service provider
The board of directors at Company XYZ wants to keep the companies and billing separated.
While the Chief Information Officer (CIO) at Company XYZ is concerned about the confidentiality
of Company XYZ’s customer data and wants to share only minimal information about its
customers for the purpose of accounting, billing, and customer authentication.
The proposed solution must use open standards and must make it simple and seamless for
Company XYZ’s customers to receive all four services.
Which of the following solutions is BEST suited for this scenario?

A.
All four companies must implement a TACACS+ web based single sign-on solution with
associated captive portal technology.

B.
Company XYZ must implement VPN and strict access control to allow the other three
companies to access the internal LDAP.

C.
Company XYZ needs to install the SP, while the partner companies need to install the WAYF
portion of a Federated identity solution.

D.
Company XYZ needs to install the IdP, while the partner companies need to install the SP
portion of a Federated identity solution.