What is the purpose of the 21-gun salute?

The 21-gun salute serves multiple ceremonial purposes, which is why the correct answer includes all the given options. This salute is a prominent military tradition used to honor distinguished individuals, notably high-ranking military leaders and heads of state, as a sign of respect. Additionally, it is utilized to mark significant ceremonial occasions, such as the salute rendered at the inauguration of a president or during state funerals. Furthermore, the 21-gun salute is also fired during national holidays like Independence Day in the United States, celebrating the nation and its values. Thus, the salute encompasses a wide range of ceremonial significance, making the inclusion of all provided options accurate.