A manufacturer of bolts had a quality-control policy that requires it to destroy any bolts that are more than 2 standard deviations of the mean. The quality control engineer knows that the bolts coming off the assembly line have mean length of 15 cm with a standard deviation of .10 cm. For what lengths will a bolt be destroyed? A) a bolt will be destroyed if the length is less than ___ cm or greater than _____ cm B) a bolt will be destroyed if the length is between ___ cm and ____ cm C) a bolt will be destroyed if the length is less than ___ cm D) a bolt will be destroyed if the length is greater than ____ cm