*Question E8B10:
What is frequency division multiplexing (FDM)?*  

*Correct Answer is  B: Dividing the transmitted signal into separate frequency bands that each carry a different data stream*  

### AI Response: (may contain errors)  

Frequency Division Multiplexing (FDM) is a technique used to transmit multiple signals simultaneously over a single communication channel by dividing the available bandwidth into separate frequency bands. Each band carries a different data stream. This allows multiple signals to be sent at the same time without interfering with each other.

### Explanation:

1. **Correct Answer (B):**  
   - **Dividing the transmitted signal into separate frequency bands that each carry a different data stream** is the essence of FDM. Each data stream is modulated onto a different carrier frequency, and these carriers are spaced apart so that they do not overlap, allowing simultaneous transmission.

2. **Why Other Choices Are Incorrect:**
   - **Choice A:** "The transmitted signal jumps from band to band at a predetermined rate" describes Frequency Hopping Spread Spectrum (FHSS), not FDM.
   - **Choice C:** "The transmitted signal is divided into packets of information" refers to packet switching, which is a method used in digital communications, not FDM.
   - **Choice D:** "Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter" describes a form of digital multiplexing and modulation, not FDM.

### Key Points:
- **FDM** is used in analog systems like traditional radio and television broadcasting.
- **Bandwidth Allocation:** Each signal is assigned a specific frequency range within the overall bandwidth.
- **Non-Overlapping Bands:** Ensures that signals do not interfere with each other.

Understanding FDM is crucial for recognizing how multiple signals can be efficiently transmitted over a single channel without interference.