What are three ways for a Salesforce Administrator to meet this requirement?

Universal Containers has built a Partner Community for its users. Users must accept an agreement when logging into the Community for the first time.

What are three ways for a Salesforce Administrator to meet this requirement? (Choose three.)
A . Leverage audiences and page variations to hide content in the Community until the user agreement has been accepted.
B . Use login flows to show the user agreement when Community users log in for the first time.
C . Build a Site.com page with a user agreement and replace the login page with “complete registration on acknowledgment.”
D . Redirect users to a custom page displaying a user agreement before users log in for the first time.
E . Customize the user registration page to include the user agreement and “complete registration on acknowledgment.”

Answer: AE