Explanation:

All statements are correct.

• The Ancient Monuments and Archaeological Sites and Remains (AMASR) Act is an important piece of legislation in India that aims to preserve and protect the country’s rich heritage and cultural assets. The act was passed in 1958. It applies to all monuments that are over 100 years old, whether they are in public or private ownership. The act prohibits any construction activity or alteration to the protected area around ancient monuments without the approval of the National Monuments Authority (NMA).

• This protected area is defined as a 100-metre radius around the monument, and a regulated area extends up to 200 metres beyond that. The NMA is the regulatory authority responsible for implementing the AMASR Act.

Hence option 4th is correct.