A. It is possible to gather analytics data without login. Service developers need to define distinct analytic realms for authenticated and unauthenticated users.

B. Authentication is mandatory in MCS. All users must provide credentials on a login page.

C. MCS can gather analytics data whether or not a user is authenticated. To accomplish this, the mobile application will need to perform anonymous authentication.

D. There is no anonymous access to the analytics API in MCS. Like the storage feature, analytics requires users to be authenticated.