Correct statement(s) among the following regarding comparison of oxidation states of d-block metals and p-block metals is/are:

The stability of lower oxidation state increases down the group in p-block while that of higher oxidation state increases down the group in d-block.

p-Block metals in general don’t form compounds with zero oxidation state while d-block metals form compounds of zero oxidation state with p-acceptor ligands like CO.

The colour of compounds of p-block metal ions as well as d-block metal ions is due to only their equal ability to exhibit variable oxidation states.

The variable oxidation states of p-block differ by two units while that of d-block differ by unity.