Which of the following statement(s) is/(are) correct ?

The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons.

The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons.

In nuclear fusion, energy is released by fusing two nuclei of medium mass (approximately 100 a.m.u.)

In nuclear fission, energy is released by fragmentation of a very light nucleus.