Fill in the blank with the appropriate answer.
When installing communication wires and cables in cable routing assemblies, horizontal supports for cable routing assemblies shall be installed at intervals not to exceed _____ at each end or joint unless listed otherwise. In no case shall the distance between supports exceed _____.
A) 3 ft/6 ft
B) 3 ft/10 ft
C) 4½ ft/8 ft
D) 5 ft/10 ft