In Michael Cohn's ADAPT framework, the acronyms ETC and IC mean and have the purpose of:

A$)$ Enterprise Transition Community, which works in improvement iterations, to improve the way the organization uses Agile, and Improvement Community, to remove impediments that are preventing the transition to Agile.

B$)$ Enterprise Transformation Community, to remove impediments that are preventing the transition to Agile, and Iterative Community, which works in improvement iterations, to improve the way the organization uses Agile.

C$)$ Enterprise Transition Community, to remove impediments that are preventing the transition to Agile, and Improvement Community, which works in improvement iterations, to improve the way the organization uses Agile.

D$)$ Enterprise Transformation Community, which works in improvement iterations, to improve the way the organization uses Agile, and Interactive Community, to remove impediments that are preventing the transition to Agile