Option 4, "Salaries of important officials," is related to the Second Schedule of the Indian Constitution. The Second Schedule includes provisions regarding the emoluments, or salaries, of important officials in the country. This includes the President, the Vice President, the Governors, and the Union Ministers. The Schedule provides details about the salaries, allowances, and privileges that these officials are entitled to receive. It also establishes the procedure for determining and modifying these salaries, which are paid from the Consolidated Fund of India. The inclusion of this topic in the Second Schedule emphasizes the importance of ensuring proper remuneration for key officials who play crucial roles in the functioning of the Indian government.