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In live-ops, the 'D1 / D7 / D30 RETENTION' metric tracks which?

ATotal daily revenue grouped per day-of-week always
BFraction of new users still active after 1/7/30 days
CAverage download time of the app per user installed
DNumber of friends invited by each new user that joins
Answer & Solution
Correct answer: B. Fraction of new users still active after 1/7/30 days
Standard cohort analysis: pick install-day cohort; measure % returning each day after. D1 typical 30-50%; D30 typical 5-15% for mobile.
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