You would like to apply the NDVI function on a Landsat 8 image to measure the amount of vegetation present in a given pixel. Which step should you perform to calculate the index?
A) Subtract the red band from the near-infrared band
B) Add the red band to the near-infrared band
C) Divide the near-infrared band by the red band
D) Multiply the near-infrared band by the red band
