Which certificate or certificates should you identify?

Your network contains an Active Directory domain named contoso.com.
Your company has an enterprise root certification authority (CA) named CA1.
You plan to deploy Active Directory Federation Services (AD FS) to a server named Server1.
The company purchases a Microsoft Office 365 subscription.
You plan to register the company’s SMTP domain for Office 365 and to configure single sign-on for all users.
You need to identify which certificate or certificates are required for the planned deployment.
Which certificate or certificates should you identify? (Each correct answer presents a complete solution. Choose all that apply.)
A. a server authentication certificate that is issued by a trusted third-party root CA and that contains the subject name serverl.contoso.com
B. a server authentication certificate that is issued by CA1 and that contains the subject name Server1
C. a server authentication certificate that is issued by a trusted third-party root CA and that contains the subject name Server1
D. a server authentication certificate that is issued by CA1 and that contains the subject name serverl.contoso.com
E. self-signed server authentication certificates for server1.contoso.com