$2.$ An electronic guidance system for a Mars exploration project consists of:

Components A$,$ B$,$ C$,$ and D which have reliabilities of $0\mathrm{.}985,0\mathrm{.}978,0\mathrm{.}926,$ and $0\mathrm{.}994,$

respectively. If they operate sequentially:

b$.$ Suppose the space agency requires a reliability of at least $0\mathrm{.}985.$ Try to find a

configuration that meets this requirement using the minimum number of

components, in serial or parallel configuration. You should draw the design

configuration to support your answer.