A rectangle with one side on the $x-$axis has its upper vertices on the graph of $y=cosx$ as shown in the figure below. What is the maximum area of the rectangle?

A$.0\mathrm{.}860$

B$.0\mathrm{.}982$

C$.1\mathrm{.}122$

D$.3\mathrm{.}426$

E$.6\mathrm{.}577$