Discussion
Why is a guard time left between adjacent channel slots?
Answer: C
Guard time absorbs pulse spreading and timing jitter so that one channel's energy does not appear in its neighbour's slot, which would be crosstalk. Gain control settling, synchronisation and amplitude equalisation are separate matters, and synchronisation has its own slot rather than living in the guard time. Any system that divides a resource into slots must leave margin at the boundaries, whether the resource is time or frequency. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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