EcoRI restriction sites on a $10$ kb DNA fragment are shown below.

Upon partial digestion, what are the lengths (in kb) of all the possible DNA fragments obtained?

1. $2,3,4,5,6,7,8$, and $10$
2. $2,3,4,5,6,$ and $7$
3. $2,3,4,$ and $7$
4. $2$ and $3$