\textbf{177.} In heavy nuclei, a proton with electrostatic force, ............, and with nuclear force ............
(1) Only nearby protons repel it --- all nucleons inside the nucleus attract it.
(2) All nucleons inside the nucleus repel it --- only nearby nucleons attract it.
(3) Only nearby neutrons and protons repel it --- all nucleons inside the nucleus attract it.
(4) All protons inside the nucleus repel it --- only nearby nucleons attract it.