A single fiber can handle as many voice channels as
∙ A. a pair of copper conductors
∙ B. a 1500-pair cable
∙ C. a 500-pair cable
∙ D. a 1000-pair cable
∙ A. a pair of copper conductors
∙ B. a 1500-pair cable
∙ C. a 500-pair cable
∙ D. a 1000-pair cable