Which type of record should you create in each zone?

You are planning an Exchange Server 2016 organization. The organization will contain a Mailbox server named
EX01.
Users will have primary SMTP email addresses in the following domains:
Contoso.com
Fabrikam.com
Cohowinery.com
Wingtiptoys.com
You need to add a DNS record to provide Autodiscover for each domain.
Which type of record should you create in each zone?

A.
CERT

B.
A

C.
MINFO

D.
PTR

Explanation:
http://www.techieshelp.com/create-autodiscover-record/