Explanation:

- An Astronomical Unit (AU) measures the average distance from the Earth to the Sun. It is used in astronomy to describe distances within our solar system.

- A Parsec is another astronomical unit of measurement. It is equal to about 3.26 light-years and is used to measure astronomical distances outside our solar system.

- Both are units of length.

- Option 1: Volume is the amount of space occupied by a substance or object, often measured in liters or cubic meters.

- Option 2: Current is the flow of electric charge, measured in amperes (amps).

- Option 3: Mass is the amount of matter in an object, measured in kilograms or grams.

- Option 4: Length is a measure of distance or size, often measured in meters, kilometers, or miles.