Q: Which report shows users who initiated sessions over 1-day, 7-day, 14-day, and 30-day periods?
A) Users Flow report
B) User Explorer report
C) Cohort Analysis report
D) Active Users report
Correct Answer is D) Active Users report.
The metrics in the Active Users Report are relative to the last day in the date range you are using for the report.
Read more here: https://support.google.com/analytics/answer/6171863