What Happens When Intellectual Property Rights Expire

What happens when intellectual property rights expire?

A) The intellectual property is said to enter 'the public domain' and become freely available.
B) The intellectual property rights are transferred to the state.
C) The intellectual property enters the public domain but cannot be copied or reproduced without the express approval of the previous owner of the IP rights.
D) The intellectual property becomes the private property of the owner and cannot be reproduced by anyone.