Choose the appropriate word. The boy ... I talked to This

1). The boy who I talked to. Мальчишка, с которым я разговаривал. The boy is a person, that is why we use who.

2). This is the dog that Id like to buy. Это собака, которую я хотел бы покупать. The dog is not a person, that is why we use that.

3). Do you know the girl who is standing near the window? Ты знаешь девченку, которая стоит у окна? The girl is a person, that is why we use who.