Revision passage: A public lecture series invited several researchers to speak about local water quality. One guest had not answered the invitation, and the proposed topic was listed without an owner. The coordinator reviewed the planning notes. She asked [whose been invited to speak, whether the topic is his or her's, and why the guest hasnt replied]. An assistant located the invitation record and sent a reminder. The program was updated after the guest responded. Which revision correctly uses who has, the possessive pronouns, and has not?