Which of the following statements about standpipe and hose systems is MOST accurate?

Which of the following statements about standpipe and hose systems is MOST accurate?
 
  A. Standpipe and hose systems can take the place of sprinkler systems, or lessen the need for sprinklers.
  B. Standpipe systems give no advantage in one-story structures, and are rarely installed in these structures.
  C. In many high-rise buildings, a standpipe is the primary means for manual extinguishment and overhaul of a fire.
  D. Standpipe systems are designed only for use by building occupants, they do not serve the needs of firefighters.