Which of the Following Strength Training Guidelines Are Included in the U.S

Which of the following strength training guidelines are included in the U.S. Department of Health and Human Services Physical Activity Guidelines?

A) Strength training for all major muscles groups should occur twice per week.
B) Strength training should occur a minimum of 4 days per week.
C) Strength training can be limited to solely the areas that need to be toned.
D) Strength training guidelines are not included in the Physical Activity Guidelines.