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3-68. In optical fiber, light travels through the. a. b. cladding .Neither A norB core 3-69 The ability to transmit in two directions simultaneously is a. parallel communication b. ull-duplex communication e. Both A and B d. Neither A nor B 3-70 The ability to transmit in two directions simultaneously is called parallel transmission. a. True b. False 3-71 For full-duplex transmission, optical fiber normally uses a. strand b. 2 strands c. 4strands d. 8 strands e. 6 strands 3-72. Which of the following has a single connector type? a. Optical fiber. b. UTP c. Both A and B d. Neither A nor B