You have a DNS server named Server1 that runs Windows Server 2012. On Server1, you create a DNS zone named contoso.com. You need to specify the email
address of the person responsible for the zone. Which type of DNS record should you configure?
1. Start of authority (SOA)
2. Mail exchanger (MX)
3. Host information (HINFO)
4. Mailbox (MB)
Answer: Pending
Correct answer is 1. Start of authority (SOA)
The responsible person field shows the e-mail address of the administrator responsible for the zone. It uses a period (.) instead of an at symbol (@).
https://technet.microsoft.com/en-us/library/cc958958.aspx