In regard to exercise, which of the following statements about safety consideration is correct?

In regard to exercise, which of the following statements about safety consideration is correct?

a. In hot weather, exercising between 10
a. m. and 4 p.m. is best.
b. Exercising at 100% of your maximum heart rate is best.
c. Exercising one hour before eating is best.
d. Remaining well-hydrated while exercising is best.