Select the correct statements about the compound ${\mathrm{NO}}^{+}{\left[{\mathrm{BF}}_4\right]}^{-}?$

${\mathrm{NO}}^{+}{\left[{\mathrm{BF}}_4\right]}^{-}$
Bond order of ${\mathrm{NO}}^{+}$ is 3, one sigma bond and two pi bond. Number of pi-bonds is 2 and sigma bond is 5.

Bond order of ${\mathrm{NO}}^{+}$ is 3.0 and $\mathrm{NO}$ is 2.5. Bond order is inversely proportional to bond length. 
${\mathrm{NO}}^{+}$ is diamagnetic and ${\left[{\mathrm{BF}}_4\right]}^{-}$ is diamagnetic.

B−F bonds are longer in ${\left[{\mathrm{BF}}_4\right]}^{-}$​ than in ${\mathrm{BF}}_3$​ due to absence of pπ−pπ back bonding in ${\left[{\mathrm{BF}}_4\right]}^{-}$.