The correct option is A BIS Hallmark
BIS Hallmark is a purity certification of gold and silver articles in accordance with Indian Standard specifications. The Bureau of Indian Standards, the country's apex standards body, is involved in the development of technical standards (popularly known as Indian Standards), product quality and in all matters concerning standardisation, certification and quality. Gold and silver articles are evaluated and tested at an official Assaying and Hallmarking Centre and then certified that the metal used conforms to the national and international standard of fineness and purity.