Your 35-year-old female client Is In the first trimester of her pregnancy and has been...

She should exercise at a comfortable intensity and use the ratings of perceived exertion scale rather than heart rate to monitor exercise intensity.

She should exercise at a comfortable intensity and use a heart rate monitor to more accurately monitor intensity.

She should exercise at an RPE of 4-5 on the 10-point scale and use a heart rate monitor to assure she does not overexert.

She should exercise at an RPE of 9-11 on the Borg scale of 6-20 and use a heart rate monitor to more accurately monitor exercise intensity.