Meg, Sandy, Chang, and Nathan used different methods to protect themselves from over-exposure to the sun. Their methods are listed below: Meg: Use a sun tanning or UV tanning booth instead of staying on the beach for long hours Sandy: Stop all outdoor activity and always stay indoors Chang: Apply sunscreen half an hour before going out and reapply every 2 hours Nathan: Use sunscreen with very low SPF once per day Who used the best method for daily activity?