Answer: [Option 4]
The purpose of public hearings conducted by ERCs is to provide a platform for citizens to voice their views to the ERC, facilitate meaningful interactions and cross-learning between various sector actors, build consumer networks, and enable collective action.
Explanation: These hearings are held in-person, "they do more than just provide a platform for citizens to voice their views to the ERC. They facilitate meaningful interactions and cross-learning between various sector actors, help to build consumer networks, and enable collective action."