Which statement about boron nitride, $(\mathrm{BN}{)}_x$, is correct?

1. AThe hexagonal form has $s{p}^2$ B and N in layers and is an electrical insulator, while the cubic form (all $s{p}^3$) is extremely hard
2. BThe cubic form is a soft lubricant with $s{p}^2$ atoms
3. CThe hexagonal form is a good conductor of electricity like graphite
4. DIn the hexagonal form, both B and N are $s{p}^3$ hybridised