Which of the following are Lewis acids ?

$\mathrm{AlCl}_{3}$ and $\mathrm{SiCl}_{4}$

$\mathrm{PH}_{3}$ and $\mathrm{SiCl}_{4}$

$\mathrm{BCl}_{3}$ and $\mathrm{AlCl}_{3}$

$\mathrm{PH}_{3}$ and $\mathrm{BCl}_{3}$