$2.$ Consider the process below, with the defective rate indicated for each step:

a$)$ What is the current reliability of the process?

b$)$ What is the reliability of the process if one stand$-$by station is added in parallel to Step $1.$ Assume that the new station has a reliability of $\backslash (75\backslash \%\backslash ).$

c$)$ Due to cost considerations, instead of adding a stand$-$by station to Step $1$ management is considering an alternative stand$-$by process to Steps $1$ and $2,$ as shown below. What is the reliability of this alternative process?