The correct answer to the following question will be "_msdcs".
Explanation:
Msdcs directory known as Microsoft Domain Controller Catalog requires SRV documents that are used to identify domain controller for certain operations.
It automatically generated subdomain keeps all Microsoft-hosted resources SRV data, so it's the correct answer.
It includes common SRV documents, documents of LDAP, documents of Kpass, CNAME, etc.
