Explanation:

Reusable OmniScripts are OmniScripts that can be embedded within other OmniScripts to create modular and reusable components. They can be nested up to unlimited levels deep, as long as there are no circular references or conflicts between the parent and child OmniScripts.
The other options are not correct because:
2: This is too low and does not reflect the full potential of reusable OmniScripts. 5: This is also too low and does not reflect the full potential of reusable OmniScripts.
1: This is incorrect and does not make sense, as reusable OmniScripts are meant to be nested within other OmniScripts.