*Question E2C02:
Which of the following file formats is used for exchanging amateur radio log data?*  

*Correct Answer is  C: ADIF*  

### AI Response: (may contain errors)  

The correct answer to the question about file formats used for exchanging amateur radio log data is **C: ADIF**.

### Explanation of the Correct Answer:
- **ADIF (Amateur Data Interchange Format)** is a standard file format specifically designed for the exchange of log data among amateur radio operators. It allows for the sharing of information such as call signs, frequencies, and other relevant details in a structured way that can be easily read by various logging software.

### Why the Other Choices are Incorrect:
- **A: NEC**  
  - NEC stands for Numerical Electromagnetics Code, which is a software tool used for modeling antenna performance. It is not a file format for log data exchange.

- **B: ARLD**  
  - ARLD is not a recognized file format for log data. It may refer to a specific type of amateur radio bulletin or report but does not pertain to log data exchange.

- **D: OCF**  
  - OCF stands for Open Communications Framework, which is not a standard file format for amateur radio logs. It is more related to software development and communication protocols rather than log data.

### Summary:
- **ADIF** is the correct format for exchanging amateur radio log data.
- The other options (NEC, ARLD, OCF) do not pertain to log data exchange and serve different purposes in the amateur radio context. 

Understanding these distinctions will help you in the exam and in practical amateur radio operations.