What is the main difference between Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA)?

The distinction between Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA) lies fundamentally in how these two technologies allocate resources for communication. TDMA allocates specific time slots for each user to transmit their data over a shared medium; during their designated time slot, a user can send information without interference from others. This method ensures that each user has a fair opportunity to communicate while efficiently sharing the same frequency channel.

On the other hand, FDMA divides the available bandwidth into different frequency bands, allowing multiple users to transmit simultaneously on different frequencies. Each user has a unique frequency channel assigned, which they can use continuously, avoiding interference from others by utilizing separate frequency ranges.

This resource allocation approach is what differentiates the two technologies: TDMA focuses on timing, while FDMA focuses on frequency. The other options misrepresent the core principles of TDMA and FDMA or incorrectly identify their applications, but the essence of option B accurately captures the main differentiating feature between these two multiple access methods.