If we transfer machines $1,2,3,$ amd $4$ of SMD assembly like from the western plant to the eastern plant, we will have two layout design options from which to choose. Let's start with option $1.$ In this option, we only have one series design$-$SMD assembly like. In case a particular machine $(1,$or or $3$ or $4)$ breals down, a backup machine is available for each as a parallel to perform the job. What is the reliability of the option $1$ design