which of the following statements is not true? "whom" can serve as the object of a preposition."whom" is an object pronoun."who" and "whom" are personal pronouns."who" is a subject pronoun.i really need !

"Whom" can serve as the object of a preposition.
True; Ex. With whom did you go to the mall?

"Whom" is an object pronoun.
True; Ex. To whom did you give the book?

"Who" and "whom" are personal pronouns.
False; Who and whom are relative pronouns. Personal pronouns are: I, you, he, she, him, her, it, we, they, us, them. 

"Who" is a subject pronoun.
True; Ex. Who is running?

Is there a picture of it?