A manufacturing company implementing JIT has a target production rate of $10\mathrm{.}000$ units per month. The company operates $25$ working days a month with single shift $(8$ hours$)$ each day. The company produces three different models X$,$ Y and Z and their sales distribution are $\%20$ X$,\%20$ Y and $\%60$ Z$.$ What is the production sequence?

Z$-$X$-$Z$-$Y$-$Z$-$Z$-$X$-$Z$-$Y$-$Z

Z$-$Z$-$X$-$Y$-$Z$-$Z$-$X$-$Y

Z$-$X$-$Y$-$Z$-$X$-$Y

X$-$Z$-$Y$-$Z$-$X$-$Z$-$Y$-$Z