You need to configure your single button IP phones so they can answer both internal calls to their 4 digit extension and also their DID number. Which of the following ephone-dn configurations should you use?
A.
Ephone-dn 10 Number 2000 mask 408555xxxx
B.
Ephone-dn 10 dual-line Number 2000 DID 4085552000
C.
Ephone-dn 10 dual-line Number 2000 secondary 4085552000
D.
Ephone-dn 10 Number 2000 DID 4085552000