Two solid blocks at temperatures T₁ and T₂ (T₁ T₂ ) are put in thermal contact for a long time inside an insulated container. Choose the correct statement(s).

Options

1. ASubsequent spontaneous regaining of the initial temperatures by the two blocks does not violate the first law
2. BThe amount of energy released by the hot block is equal to the amount absorbed by the cold block.
3. CThe entropy of the system is maximum when thermal equlibrium is attained.
4. DThe decrease in entropy of the hot block is equal in magnitude to the increase in entropy of the cold block.