A Garage Door Opener Has Three Sections,which Have Reliabilities of .9,.8,and

Multiple Choice

A garage door opener has three sections,which have reliabilities of .9,.8,and .9.The lowest of these has an identical backup which automatically goes on if the original fails.All three parts must operate to perform its intended function.The system reliability is closest to:

A) .40
B) .50
C) .60
D) .70
E) .80