A parallel$-$plate capacitor has square plates $7\mathrm{.}5$ cm on a side, separated by $0\mathrm{.}29$ mm$.$ The capacitor is charged to $12$ V$,$ then disconnected from the charging power supply. Which of the following is correct for the capacitance C $($expressed in nano$-$farads, nF$)$ of this capacitor and the energy density up $($expressed in milli$-$joules per cubic$-$meter, m$.$J$/$m$\text{'})$ in the electric field between the plates?C $=1\mathrm{.}7$ nF$,$ up $=0\mathrm{.}765$ mJ$/$m$3$C $-0\mathrm{.}765$ nF$,$ Ug $=1\mathrm{.}7$ mJ$/$m$$C $=17$ nF$,$ Ug $=765$ mJ$/$m$\text{'}$C $-7\mathrm{.}65$ nh$,$ up $=0\mathrm{.}17$ mJ$/$m$\text{'}$C $=0\mathrm{.}17$ nF$,$ UE$.=7\mathrm{.}65$ mJ$/$m$\text{'}$