You administer two Microsoft SQL Server 2012 servers. Each server resides in a different, untrusted domain.
You plan to configure database mirroring.
You need to be able to create database mirroring endpoints on both servers.
What should you do?

A.
Configure the SQL Server service account to use Network Service.

B.
Use a server certificate.

C.
Use a database certificate.

D.
Configure the SQL Server service account to use Local System.

Explanation:
To enable certificate authentication for database mirroring on a given server instance, the system administrator
must configure each server instance to use certificates on both outbound and inbound connections.
https://docs.microsoft.com/en-us/sql/database-engine/database-mirroring/use-certificates-for-adatabase-mirroring-endpoint-transact-sql