Section 100 Patents Act 1970 deals with 'use of patented inventions for purposes of Government'. A patent owned by:

1. Section 100(1) Patents Act 1970: 'Notwithstanding anything contained in this Act, at any time after an application for a patent has been filed at the patent office or a patent has been granted, the Central Government and any person authorised in writing by it, may use the invention for the purposes of Government in accordance with the provisions of this Chapter.' 2. Section 100(3): the patentee shall be paid such adequate remuneration as may be agreed upon, OR in the absence of agreement, as determined by the High Court under Section 103. 3. Section 102 enables acquisition of patents by Central Government. 4. The provisions are India's TRIPS Article 31 flexibilities for government use. 5. Hence option A is correct. _Source: Patents Act 1970 / Copyright Act 1957 / Trade Marks Act 1999 (Bare Acts, IPIndia portal + Copyright Office) — Patents Act 1970, Section 100_