Using a Camera with a Fixed Focal Length Lens,how Will

Multiple Choice

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

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