Which of the following cannot act as Lewis acid ?

In CCl4 the certral atom carbon can't acts as lewis acid, due to lack of empty d-orbitals in its valency shell→ Where as in remaining tetrahalides [SiCl4,GeF4,SnCl4] the central atom cantains empty d-orbital in their valency shell and hence they can accept the electron pair from lewis bases and shows lewis acidic character