With regard to conference node redundancy, if a region requires 2400 G.711 ports, then how many nodes should it include?
A. Two nodes, each with a capacity of 1200 G.711 ports
B. Three nodes, each with a capacity of 1200 G.711 ports
C. One node with a capacity of 2400 G.711 ports
D. One node with a capacity of 1200 G.711 ports
