Which among the following countries have apologised to the people they have ruled/defeated or colonialised?

Both 2 and 3

It is not uncommon for the losing side in a war to be forced to apologise for the bad things that it did. It is only rarely that the winners accept that they were guilty of wrong doing. However, in recent times there have been many such examples from around the world. Nations or communities that were on the ‘winning’ side, or that are still in a dominant position, are beginning to accept that they have been responsible for grave injustices in the past and are seeking to apologise to the affected communities.

In Australia, there has been a long debate on an official apology from the Australian nation (where the majority of the population today is of white-European origin) to the descendants of the native peoples who were the original inhabitants of the forcibly colonised land. Most state governments in Australia have passed some variant of apology resolution.

In Japan, official policy has long recognised the need to apologise for the atrocities of war and colonisation during the periods when Japan occupied parts of East Asia including Korea and parts of China.