A company is using a Kanban system with $2$ containers, each holding $50$ parts, between a downstream $($using$)$ and an upstream $($producing$)$ work center. The using work center can handle $250$ jobs per day. The average elapsed time for the entire cycle is currently $0\mathrm{.}25$ days. The company is concerned about the safety factor for the operation. Which of the following is the safety factor $(\backslash$alpha $)$ of the current operation?

a$.20$ percent

b$.60$ percent

c$.80$ percent

d$.40$ percent