Ziegler-Natta অনুঘটক কোনটি?

$\mathrm{TiCl}_{4}+\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{H}_{2}\right)_{2} \mathrm{Cl}$

$\mathrm{TiCl}_{3}+\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{Cl}$

$\mathrm{TiCl}_{3}+\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3}$

$\mathrm{TiCl}_{3}+\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{H}_{5}\right) \mathrm{C}_{2}$