?A(n) ____ is a service from local telephone companies in which up-to-date telephone facilities at the telephone company's central (local) office are offered to business users, so that they don't need to purchase their own facilities.
A. ?local exchange carriers (LECs)
B. ?central office exchange service
C. ?interexchange carriers (IECs or IXCs)
D. ?private branch exchange (PBXs)
Answer: B
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