Which range is correct?

When configuring a Cisco Expressway solution and need to design the dial plan with various rules for URIs and numbers coming through the device. To do so, it is important that some dial plan rules are applied in a certain order. When configuring the transform section, you must know the range of the priorities.

Which range is correct?
A . any number in the drop-down menu
B . any number in the dialog box
C . any number between 1-128
D . any number between 1-65534

Answer: D