$170$ units of end item Z are needed at the beginning of week $12.$ Prepare a material requirement plan for component C$.$ Consider that on hand there are $75$ units of Z$,40$ units of A$,55$ units of B$,$ and $40$ units of C$.$ Also, there is a Scheduled receipt of $45$ units of component C in week $4.$ Lead times are three weeks for Z and $,$ and one week for the other components. Assume lot$-$for$-$lot ordering except for C$,$ where