In general, ________ can be used in warehouses with storage that does not exceed 40 ft. (12 m) in overall height and with a ceiling height of less than 45 ft. (14 m)

a. wet pipe sprinkler systems
b. early-suppression, fast-response (ESFR) sprinkler systems
c. deluge sprinkler systems
d. preaction sprinkler systems

b