Which type of Session Initiation Protocol directory number supports the assignment of up to 10 telephone numbers and up to two active calls?

Which type of Session Initiation Protocol directory number supports the assignment of up to 10
telephone numbers and up to two active calls?

A.
multiple-number directory number (using single-line ephone-dns)

B.
dec-line

C.
multiple-number directory number (using dual-line ephone-dns)

D.
sip-ten-line