*Question E0A07:
What is meant by “100% tie-off” regarding tower safety?*  

*Correct Answer is  B: At least one lanyard attached to the tower at all times*  

### AI Response: (may contain errors)  

The term "100% tie-off" in tower safety refers to the practice of ensuring that a climber is always secured to the tower with at least one lanyard. This is crucial for preventing falls and ensuring the safety of individuals working at heights.

### Correct Answer: 
**B: At least one lanyard attached to the tower at all times**

- **Explanation**: This choice emphasizes the importance of maintaining a continuous connection to the tower while climbing or working. By having at least one lanyard attached, the climber minimizes the risk of falling, as they are secured to the structure at all times.

### Why the Other Choices are Incorrect:

- **A: All loose ropes and guys secured to a fixed structure**  
  - This choice focuses on securing ropes and guy wires, which is important but does not specifically address the climber's safety. It does not ensure that the climber is tied off at all times.

- **C: All tools secured to the climber’s harness**  
  - While securing tools is a good safety practice to prevent dropping them, it does not relate directly to the climber's fall protection. This choice does not address the requirement of being tied off to the tower.

- **D: All circuit breakers feeding power to the tower must be tied closed with tape, cable, or ties**  
  - This choice pertains to electrical safety rather than fall protection. While it is important to ensure that power is safely managed, it does not relate to the climber's tie-off status.

### Summary:
In tower safety, "100% tie-off" means that a climber must always be secured to the tower with at least one lanyard. This practice is essential for preventing falls and ensuring safety while working at heights.