What Is the Minimum Exercise Recommendation for School-Age Children

What is the minimum exercise recommendation for school-age children?

A) 20 to 30 minutes of vigorous exercise six times per week
B) 30 to 45 minutes of vigorous exercise five times per week
C) 45 to 60 minutes of moderate to mild exercise seven times per week
D) 60 to 120 minutes of moderate to mild exercise seven times per week