Which of the Following Is Not a Problem Associated with Carrier

Multiple Choice

Which of the following is not a problem associated with carrier associated signaling (CAS) ?

A) the ease of placing fraudulent calls
B) the need to turn off the robbed bit signaling function when transmitting high-speed data
C) the inability to carry signaling messages, with special feature information, between switches or between the switch and the telephone
D) none of the above