Explanation
Box 1: Yes
Managed solutions are used to deploy to any environment that isn't a development environment for that solution.
Box 2: No
Unmanaged solutions can be exported either as unmanaged or managed.
Box 3: Yes
You can't edit components directly within a managed solution. To edit managed components, first add them to an unmanaged solution.
Reference:
https://docs.microsoft.com/en-us/power-platform/alm/solution-concepts-alm