*Question E2C07:
What is the Cabrillo format?*  

*Correct Answer is  A: A standard for submission of electronic contest logs*  

### AI Response: (may contain errors)  

The correct answer to the question about the Cabrillo format is:

**A: A standard for submission of electronic contest logs.**

### Explanation:

1. **Why the correct answer is correct:**
   - The Cabrillo format is specifically designed for submitting electronic logs from amateur radio contests. It provides a standardized way to format the log data, making it easier for contest organizers to process and evaluate entries. This format includes essential information such as the operator's call sign, the contest name, and the details of the contacts made during the contest.

2. **Why the other choices are incorrect:**
   - **B: A method of exchanging information during a contest QSO**  
     This choice refers to the actual communication that takes place between operators during a contest, which typically involves exchanging call signs, signal reports, and other relevant information. The Cabrillo format is not used during the QSO itself but rather for submitting logs afterward.
   
   - **C: The most common set of contest rules**  
     While contests do have rules, the Cabrillo format is not a set of rules but a logging format. Contest rules dictate how the contest is conducted, while Cabrillo is about how to report the results.
   
   - **D: A digital protocol specifically designed for rapid contest exchanges**  
     This choice suggests a protocol for real-time communication during contests. Cabrillo is not a protocol; it is a file format for log submission after the contest has concluded.

### Useful Information:
- When preparing a Cabrillo log, ensure that you include:
  - Your call sign
  - The contest name
  - The date and time of each contact
  - The call signs of stations worked
  - Signal reports exchanged

This format helps streamline the log submission process and ensures that all necessary information is captured in a consistent manner.