Which of the following statements about fire department connections is MOST accurate?

Which of the following statements about fire department connections is MOST accurate?
 
  A. Fire department connects should be supplied from pumpers with a capacity of 100 gpm (400 L/min) or greater.
  B. Fire department preincident plans may identify the pressure at which the sprinkler system will be supported by pumpers.
  C. Fire department pumpers supplying connects should connect to hydrants on the same main as the sprinkler system supply.
  D. Fire department connect check valves allow sprinkler system water to flow freely back through the fire department connect.