If the velocity of light is taken as the unit of velocity and one year is the unit of time, what must be the unit of length? What is it called?

Explanation

To solve the problem, we need to determine the unit of length when the speed of light is taken as the unit of velocity and one year is taken as the unit of time.

### Step-by-Step Solution:

1. **Understanding the Relationship**:
The relationship between velocity (v), length (L), and time (T) is given by the formula:
\[
v = \frac{L}{T}
...