You Have Imported the "Choice_Transfer_to_Extension" IVR Script, So the Caller

You have imported the "choice_Transfer_to_Extension" IVR script, so the caller can dial the extension number of the person they are trying to contact. Which parameter must be edited in the script for this to work?

A) Nothing it read everything from the IP O?ice
B) First digit of the extension number
C) the time the caller has to enter the extension number
D) Length of extension number