Which of the following statements about system services in Microsoft Dynamics AX 2012 is true?

Which of the following statements about system services in Microsoft Dynamics AX 2012 is true?

A.
Services are hosted on IIS by default.

B.
Microsoft Dynamics AX 2012 Web Services is a required component.

C.
To consume the system services over the Internet, the services must be hosted on IIS.

D.
Services hosted by the Application Object Server (AOS) are available by default to all users and
applications across the Internet.