How would this be configured in the Console?

A customer has three Web sites. The customer wants a unified user database across their Web sites. For security reasons, they do NOT want seamless login when users move between any of the sites.

How would this be configured in the Console?
A . One site group with SSO disabled and one segment
B. One site group with SSO enabled and two segments
C. One site group with SSO enabled and one segment
D. Two site groups with SSO disabled and one segment

Answer: A