Match the following observations from the case with the idea or concept that it best reflects:

The growth and local success of many Nucleos depended on relying on mentors$--$advanced students who underwent a brief apprenticeship with a teacher$--$rather than teachers to lead individual classes

Giving local Nucleos the autonomy and flexibility $($i$.$e$.,$ freedom of action$)$ necessary to make decisions and adapt to local circumstances

Abreu's seemingly methodical approach to identifying a meaningful problem, laying out a compelling direction for the organization, developing relationships with everyone from students, to families, to government officials, to international aid organizations, and then developing an organization that gave the power to innovate and enrich the lives of young people to teams of local leaders.

The frequency with which Abreu had to draw on his political relationships and partners in an effort to support and sustain the work of El Sistema