Which of the following statements regarding Early Warning Systems (EWS) as per RBIs 'Master Circular - Prudential norms on Income Recognition, Asset Classification and Provisioning pertaining to Advances' guidelines is/are correct?

1. EWS helps identify accounts showing early signs of distress.
2. It includes red-flagging accounts with unusual activities.
3. EWS implementation is mandatory for all accounts, regardless of size.