There is a cat and a group of people.

I know that only one person saw the cat, and I want to know who that person is, so I ask {vIghro' leghpu' 'Iv ?}.

But if I know, that two or more people saw the cat, and I want to know who these people are, then how do I ask ?

{vIghro' leghpu' 'Iv} or {vIghro' luleghpu' 'Iv} ?