Which feature does Azure Active Directory and on-premises Active Directory both support?

You are the administrator for a company named Contoso, Ltd.
Contoso also has an Azure subscription and uses many on-premises Active Directory products as
roles in Windows Server including the following:
Active Directory Domain Services (AD DS)
Active Directory Certificate Services (AD CS)
Active Directory Rights Management Services (AD RMS)
Active Directory Lightweight Directory Services (AD LDS)
Active Directory Federation Services (AD FS).
Contoso must use the directory management services available in Azure Active Directory.
You need to provide information to Contoso on the similarities and differences between Azure
Active Directory and the Windows Server Active Directory family of services.
Which feature does Azure Active Directory and on-premises Active Directory both support?

A.
Using the GraphAPI to query the directory

B.
Issuing user certificates

C.
Supporting single sign-on (SSO)

D.
Querying the directory with LDAP

Explanation:
AD FS supports Web single-sign-on (SSO) technologies, and so does Azure Active Directory.
If you want single sign on we usually suggest using ADFS if you’re a Windows shop. Going forward
though, Azure Active Directory is another alternative you can use.
Using Azure Active Directory for Single Sign On with Yammer
https://samlman.wordpress.com/2015/03/02/using-azure-active-directory-for-single-sign-on-withyammer/