Correct statement(s) related to spinel structure is/are:

• A

  $\text{ the compounds having formula }{A}^{\mathrm{II}}{B}_2^{\mathrm{III}}{\mathrm{O}}_4\text{ have spinel structure}$

• B

  ${\mathrm{Fe}}_3{\mathrm{O}}_4\text{ has spinel structure }$

• C

  ${\mathrm{MgAl}}_2{\mathrm{O}}_4\text{ is known as spinel }$

• D

  none of these