In the case of nuclei having A > 100 ,

The binding energy per nucleon ($\dfrac{BE}{A}$) curve reaches its maximum at $A \approx 56$ and then gradually decreases for larger values of $A$.

For $A > 100$, the $\dfrac{BE}{A}$ value decreases as $A$ increases. Thus, option (2) is correct.

If a nucleus with $A > 100$ splits into two approximately equal fragments, the mass number of each fragment will be $\dfrac{A}{2}$. Since $\dfrac{A}{2}$ is closer to $56$ than $A$, the fragments will have a higher binding energy per nucleon than the original nucleus. This increase in total binding energy means that energy is released during the fission process. Thus, option (3) is correct.

If two nuclei with $A > 100$ fuse, the resulting nucleus will have a mass number greater than $200$, which has a lower binding energy per nucleon. Thus, energy is absorbed, not released. Option (1) is incorrect.

The total binding energy of a nucleus is $A \times \dfrac{BE}{A}$. Although $\dfrac{BE}{A}$ decreases slightly for $A > 100$, the increase in $A$ is much more significant, so the total binding energy increases. Option (4) is incorrect.