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When comparing FDMA $($Frequency Division Multiple Access$)$ and TDMA $($Time Division Multiple Access$)$ in wireless communication, what sets them apart?

a$.$ FDMA assigns specific time slots to users, while TDMA allocates frequency bands.

b$.$ FDMA and TDMA are interchangeable terms representing the same concept in wireless communication.

c$.$ FDMA separates users by assigning different frequency bands, whereas TDMA divides the transmission into time slots.

d$.$ FDMA and TDMA both rely on dividing time intervals for communication.

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