Which two actions should an identity architect recommend to meet these requirements?

Northern Trail Outfitters (NTO) wants to give customers the ability to submit and manage issues with their purchases. It is important for to give its customers the ability to login with their Facebook and Twitter credentials.

Which two actions should an identity architect recommend to meet these requirements? Choose 2 answers
A . Create a custom external authentication provider for Facebook.
B. Configure a predefined authentication provider for Facebook.
C. Create a custom external authentication provider for Twitter.
D. Configure a predefined authentication provider for Twitter.

Answer: B,D