Using a Camera with a Fixed Focal Length Lens, How

Multiple Choice

Using a camera with a fixed focal length lens, how will increasing the f-number affect the depth of focus and the intensity of the light reaching the ccd (or film) ?

A) The depth of focus will decrease but the intensity of light reaching the ccd will increase.
B) The depth of focus will increase as will the intensity of light reaching the ccd.
C) The depth of focus will increase but the intensity of light reaching the ccd will decrease.
D) The depth of focus will decrease as will the intensity of light reaching the ccd.