Choose correct statement/statements : (a) Nuclear force is...

- (a) Nuclear force is independent of charge of nucleons. This statement is true. Nuclear forces act equally between proton-proton, neutron-neutron, and proton-neutron pairs. - (b) Nuclear force has saturation property. This statement is true. A nucleon interacts only with its nearest neighbors, not with all other nucleons in the nucleus. This leads to saturation. - (c) Nuclear force is always Attractive is nature. This statement is false. While predominantly attractive, nuclear forces become strongly repulsive at very short distances (less than about 0.7 fm), preventing the nucleus from collapsing. - (d) Nuclear force exists in range of femtometre. This statement is true. Nuclear forces are short range forces, effective only over distances of a few femtometers ((1 \mathrm{fm}=10^{-15} \mathrm{~m})). Therefore, the correct statements are (a), (b), and (d). This corresponds to option (2).