*Question E8C11:
What is the relationship between symbol rate and baud?*  

*Correct Answer is  A: They are the same*  

### AI Response: (may contain errors)  

The correct answer to the question about the relationship between symbol rate and baud is:

**A: They are the same.**

### Explanation:

1. **Why the correct answer is correct:**
   - The term "baud" refers to the rate of signal changes or symbols per second in a communication system. Therefore, the symbol rate is measured in baud. If a system transmits one symbol per second, it is operating at a baud rate of 1 baud. Thus, the symbol rate and baud rate are equivalent.

2. **Why the other choices are incorrect:**
   - **B: Baud is twice the symbol rate**: This is incorrect because baud and symbol rate are the same. If baud were twice the symbol rate, it would imply that two symbols are being transmitted for every signal change, which is not the case.
   - **C: Baud rate is half the symbol rate**: This is also incorrect for the same reason as choice B. If baud were half the symbol rate, it would imply that each symbol represents two signal changes, which is not a standard definition.
   - **D: The relationship depends on the specific code used**: While different modulation schemes can affect how many bits are represented by each symbol, the basic definition of baud as the rate of symbols per second remains unchanged. Therefore, this choice is misleading.

### Useful Rules of Thumb:
- **Baud Rate**: The number of symbols transmitted per second.
- **Symbol Rate**: The same as baud rate; both are measured in baud.

In summary, for most basic communication systems, the symbol rate and baud rate are equivalent, making choice A the correct answer.