*Question G8C03:
What part of a packet radio frame contains the routing and handling information?*  

*Correct Answer is  C: Header*  

### AI Response: (may contain errors)  

The correct answer to the question about what part of a packet radio frame contains the routing and handling information is **C: Header**.

### Explanation:

1. **Why the correct answer is correct:**
   - The **Header** of a packet radio frame contains essential information for routing and handling the packet. This includes addresses, control information, and other metadata that help in directing the packet to its destination and managing its transmission.

2. **Why the other choices are incorrect:**
   - **A: Directory**: This term is not typically used in the context of packet radio frames. It does not refer to a specific part of the frame.
   - **B: Preamble**: The Preamble is used to signal the start of a packet and synchronize the receiver with the incoming data. It does not contain routing or handling information.
   - **D: Trailer**: The Trailer is located at the end of the packet and usually contains error-checking information (like checksums) but does not include routing or handling data.

### Summary:
- The **Header** is crucial for routing and handling in packet radio frames.
- The **Preamble** and **Trailer** serve different purposes related to synchronization and error checking, respectively.
- The **Directory** is not a standard term in this context.

Understanding these components is vital for effective communication in packet radio systems.