Unit #Sample Sample $2$Sample $3$Sample $4$Sample $573\mathrm{.}570\mathrm{.}872\mathrm{.}273\mathrm{.}671\mathrm{.}071\mathrm{.}371\mathrm{.}073\mathrm{.}172\mathrm{.}772\mathrm{.}270\mathrm{.}072\mathrm{.}671\mathrm{.}972\mathrm{.}473\mathrm{.}371\mathrm{.}170\mathrm{.}670\mathrm{.}374\mathrm{.}273\mathrm{.}6570\mathrm{.}870\mathrm{.}770\mathrm{.}773\mathrm{.}571\mathrm{.}1$A$)$ x bar and r chart are both out of controlB$)$ x bar chart is in control but r chart is out of controlC$)$ x bar chart is out of control but r chart is in controlD$)$ x bar and r chart are both in control