What are the features of user interface per change request step?

What are the features of user interface per change request step?
A . It defines the user interface on the change request step level, enabling process flexibility.
B . This definition overrules the configuration on the logical action and business activity level
C . Overall, three entity types are created. One for the design study name (ZHRCHNAME), one for the work packages (ZWPHIER), and one for the year (ZYEAR).
D . Additional UI elements are available that can be added to the single item maintenance UI in order to maintain information on higher level nodes and predecessors

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Answer: A