*Question T1C09:
[97.21(a)(b)] What is the grace period for renewal if an amateur license expires?*  

*Correct Answer is  A: Two years*  

### AI Response: (may contain errors)  

The correct answer to the question about the grace period for renewing an expired amateur license is **A: Two years**.

### Explanation:

1. **Why the correct answer is correct:**
   - According to FCC regulations, if an amateur radio license expires, the licensee has a grace period of **two years** to renew the license without having to retake the exam. This means that as long as you apply for renewal within this two-year window, you can maintain your operating privileges.

2. **Why the other choices are incorrect:**
   - **B: Three years** - This is incorrect because the grace period is specifically set at two years, not three.
   - **C: Five years** - This is also incorrect; there is no provision for a five-year grace period for license renewal.
   - **D: Ten years** - This option is incorrect as well; the grace period does not extend to ten years.

### Useful Rules of Thumb:
- Always remember that the grace period for amateur radio license renewal is **two years**. 
- If you miss the grace period, you will need to retake the exam to obtain a new license.

This information is crucial for maintaining your amateur radio privileges and ensuring you stay compliant with FCC regulations.