Correct option is (d) foot
The explanation is: The infant’s fingers and ears are too small and too delicate to attach the pulse oximeter band or the pulse oximeter clip. For infants, the blood vessels of the foot are more prominent and they give a better reception as compared to the rest of the body. Also, the infant may also move their arms/ legs so the band is attached to their foot. This way, the band won’t slip off, nor will it impede any tubes or even the diaper changing process.