单选题An alternative to plain old telephone service (POTS) would be:（）AX.25.BAsynchronous transfer mode (ATM).CVoIP.DPublic Switched Telephone Network (PSTN).
单选题
An alternative to plain old telephone service (POTS) would be:（）
A
X.25.
B
Asynchronous transfer mode (ATM).
C
VoIP.
D
Public Switched Telephone Network (PSTN).
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