One disadvantage of using an infrared wavelength laser for topographic mapping is that it is strongly absorbed by water and cannot be used to detect or map the bottom of a shallow pond or lake; however this specific disadvantage becomes an advantage for topographic mapping systems because: A. infrared lasers can be made to be eye-safe B. infrared lasers can track vehicles moving on the ground C. infrared lasers can find underground objects D. infrared energy is strongly absorbed by chlorophyll