${\mathrm{Na}}_2{\mathrm{B}}_4{\mathrm{O}}_7,10{\mathrm{H}}_2\mathrm{O}$ (Borax) can also represented as

• A

  ${\mathrm{Na}}_2\left[{\mathrm{B}}_4{\mathrm{O}}_5{\left(\mathrm{OH}\right)}_4\right],8{\mathrm{H}}_2\mathrm{O}$

• B

  $2{\mathrm{Na}}_2{\mathrm{BO}}_2,{\mathrm{Na}}_2{\mathrm{B}}_2{\mathrm{O}}_3,10{\mathrm{H}}_2\mathrm{O}$

• C

  $2{\mathrm{Na}}_2\left[{\mathrm{B}}_4{\left({\mathrm{H}}_2\mathrm{O}\right)}_4{\mathrm{O}}_7\right],6{\mathrm{H}}_2\mathrm{O}$

• D

  All the above