You have a Web application named WebApp1. WebApp1 contains one site collection.

You need to configure the Anonymous Access Restrictions settings for WebApp1.

Which settings should you modify before you configure the Anonymous Access Restrictions settings?

A.
Authentication Providers

B.
Permission Policy

C.
User Permissions

D.
User Policy

Explanation:
BURGOS MNEMO: "allow anonymous access" = "Authentication Providers"

@Kielowski explanation:
You need to Enable anonymous access first by clicking on the Default link in the Authentication Providers dialog and then clicking inside the Enable anonymous access checkbox.
In fact, they discuss this exact procedure in Wrox Professional Sharepoint 2010 Administration, pp 235-236.