*Question G2C01:
Which of the following describes full break-in CW operation (QSK)?*  

*Correct Answer is  D: Transmitting stations can receive between code characters and elements*  

### AI Response: (may contain errors)  

To understand full break-in CW operation (QSK), let's analyze the correct answer and the other choices.

### Correct Answer: 
**D: Transmitting stations can receive between code characters and elements.**

- **Explanation**: In full break-in (QSK) operation, the operator can hear incoming signals while transmitting. This means that during the gaps between Morse code characters and elements (dots and dashes), the station can receive and respond to other signals. This allows for more interactive communication, as operators can respond immediately without waiting for the end of a transmission.

### Why the Other Choices are Incorrect:

- **A: Breaking stations send the Morse code prosign “BK”**  
  - **Explanation**: While "BK" is a common prosign used to indicate a break in transmission, it does not define full break-in operation. QSK is about the ability to receive while transmitting, not about specific prosigns.

- **B: Automatic keyers, instead of hand keys, are used to send Morse code**  
  - **Explanation**: The use of automatic keyers is not a defining characteristic of QSK. Both manual and automatic keying can be used in full break-in operation. QSK focuses on the ability to receive while transmitting, regardless of the keying method.

- **C: An operator must activate a manual send/receive switch before and after every transmission**  
  - **Explanation**: This describes a manual operation mode, not full break-in. In QSK, the operator does not need to manually switch between sending and receiving; the system allows for seamless operation.

### Summary:
- Full break-in (QSK) allows for receiving signals during transmission, enhancing communication efficiency.
- The other options either describe unrelated practices or manual operations that do not align with the concept of QSK.

This understanding is crucial for the Extra Class exam, as it highlights the operational capabilities of CW communication.