The binding energy of nucleons in a nucleus can be affected by the pairwise Coulomb repulsion. Assume that all nucleons are uniformly distributed inside the nucleus. Let the binding energy of a proton be 𝐸� � and the binding energy of a neutron be 𝐸� � in the nucleus. Which of the following statement(s) is(are) correct? (A) 𝐸� �−𝐸� � is proportional to 𝑍(𝑍−1) where Z is the atomic number of the nucleus. (B) 𝐸� �−𝐸�� is proportional to 𝐴� � � where A is the mass number of the nucleus. (C) 𝐸� �−𝐸�� is positive. (D) 𝐸� � increases if the nucleus undergoes a beta decay emitting a positron.