A Time Division Multiple Access (TDMA) system where users are assigned specific time slots for transmission. The system operates under centralized control, where the control node synchronizes the time slots for each user.
Why does TDMA require guard times between user transmissions?

Correct option is B

​$$\text{In a TDMA system, multiple users share the same frequency channel but transmit in different time slots.} \\[8pt]\text{Even under centralized control and synchronization:} \\[6pt]\bullet \ \text{Small timing inaccuracies, propagation delays, and clock phase differences can occur between users.} \\[4pt]\bullet \ \text{Without separation, these imperfections may cause one user’s transmission to overlap with the next user’s time slot.} \\[6pt]\bullet \ \text{Guard times are short, unused intervals inserted between slots to prevent inter-slot interference caused by such overlaps.}$$​​