Correct Response: B. A transponder automatically receives, amplifies, and then retransmits signals in a fiber optic network. In this way, the weakened signal at the midpoint of the network is made stronger so that it can reach its destination with better reliability. A is incorrect because the issue of weakening signals over long distances is unrelated to bandwidth. C is incorrect because information is conveyed over fiberoptic networks by pulsing lights, not varying frequencies, at best this would be nonfunctional, at worst, it could make the network non-operational. D is incorrect because the optical data will still be attenuated (weakened) at the other end of the network, and the electrical data lacks all of the advantages of using fiber optics such as speed, bandwidth, and reliability.
