*Question T4B11:
Which of the following must be programmed into a D-STAR digital transceiver before transmitting?*  

*Correct Answer is  A: Your call sign*  

### AI Response: (may contain errors)  

The correct answer to the question is **A: Your call sign**. 

### Explanation:

1. **Why the correct answer is correct:**
   - In D-STAR (Digital Smart Technologies for Amateur Radio), it is mandatory to program your call sign into the transceiver before transmitting. This is essential for identification purposes, as all amateur radio transmissions must include the operator's call sign to comply with FCC regulations.

2. **Why the other choices are incorrect:**
   - **B: Your output power**: While you can adjust the output power of your D-STAR transceiver, it is not a required setting to be programmed before transmitting. The output power can be changed based on operational needs but does not need to be set for each transmission.
   - **C: The codec type being used**: D-STAR uses a specific codec (G.726) for digital voice transmission, but this is typically pre-configured in the transceiver. Users do not need to program the codec type for each transmission.
   - **D: All these choices are correct**: Since only the call sign must be programmed before transmitting, this option is incorrect.

### Summary:
- The only required setting for D-STAR transmission is your call sign, which ensures compliance with identification regulations. Output power and codec settings are adjustable but not mandatory for each transmission.