How should a listener respond when the Mu'adhin calls Hayya 'alas-salah and Hayya 'alal-falah during the Adhan?

Adhan and Iqamah: Phrasing, Echoing, and Conduct

• They should repeat those same phrases exactly.
• They should say: Sadaqta wa-bararta.
• They should say: La hawla wa la quwwata illa billah.
• They should remain completely silent.