In a Microsoft Dynamics CRM on-premises environment, you are creating a custom XAML
workflow library in a XAML workflow project by using Microsoft Visual Studio. You add a
new XAML workflow activity item to the project and specify a name for the process you are
creating. Which reference item should you add to the XAML workflow library in order for it to
compile successfully?

A.
System.Reflection

B.
System.Runtime.Serialization

C.
System.Runtime.CompilerServices

D.
System.Runtime.InteropServices