The concept of Concurrent List in the Indian Constitution is borrowed from the Constitution of Australia. In the Indian Constitution, the Concurrent List is a list of subjects on which both the central government and the state governments can make laws. These subjects are of mutual interest and concern to both the central and state governments. The subjects in the Concurrent List give power to both the central and state governments to legislate on matters such as criminal law, marriage and divorce, bankruptcy and insolvency, trade unions, education, etc. The idea behind the Concurrent List is to ensure that both levels of government have the authority to enact laws on these subjects, while also ensuring coordination and harmonization between the central and state laws. Therefore, option 3 - Australia is the correct answer.