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How does the Extended Get Digit String step differ from the Get Digit String? ()

A.It can be used in conjunction with another step. 
B.It allows the application programmer into another section of the application. 
C.Most of the Extended Get Digit String variables can be changed while the application is running. 
D.It allows the entry of a Boolean expression for the Interruptible and Clear DTMF Buffer on Retry fields.

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