Reflect on the following statements related to tracking and optimizing the 'Aha Moment' in non-transactional apps, and identify which are correctly aligned with the concept:
- Statement I: A meditation app shifts its focus from the number of sessions completed to the regularity of users engaging in weekly challenges, following user feedback.
- Statement II: A language learning app continues to measure its 'Aha Moment' by the initial lesson completion, even though users are engaging more with conversational practice features.
- Statement III: A social media app redefines its 'Aha Moment' from simply creating a profile to the frequency of user interactions, based on evolving usage patterns.
- Statement IV: A fitness tracking app maintains focus on step count as the sole 'Aha Moment' indicator, despite an increase in users utilizing diet tracking features.