What are the pre$-$exercise meal recommendations for Group Fitness Instructors?

Select one:

a$.$ Group Fitness Instructors should not consume food at least five hours before class.

b$.$ Group Fitness Instructors should consume a high$-$protein shake about $20$ minutes before class.

c$.$ Group Fitness Instructors should consume high carbohydrates and a moderate amount of protein about four hours before class.

d$.$ Group Fitness Instructors should consume a regular meal about one hour before class.