The Answers C
Probably not D, because its probably not that urgent as this machine can cause severe unconsciousness, or even death.
Maybe not A because it may not be there for the person for its too big, and it usually used in hospitals. Basically, its not portable.
Not B Either.
Answer:
first a person should 1)ask doctor.
2)A person should Mentally prepare.
3)A person start slow.
4)If a person body is comfort for that than a person return to a fitness program.