Introduction:
During the French Revolution, artists played a significant role in promoting the idea of liberty, equality, and fraternity. They used their artistic skills to spread revolutionary ideas through paintings, sculptures, and prints.

Liberty as a necessary concept:
Artists of the time of French Revolution introduced the idea of liberty as a necessary concept. They believed that liberty was essential for human progress and development. They depicted the struggle for liberty in their artworks, which inspired people to fight for their freedom. The artists also showed how liberty could lead to prosperity and happiness in society.

Liberty as an indispensable concept:
Along with being necessary, artists also portrayed liberty as an indispensable concept. They believed that without liberty, human beings could not live a dignified life. Artists emphasized the importance of liberty in their artworks, which helped in raising the consciousness of people towards the value of freedom.

Liberty as a female figure:
One of the most striking ways in which artists portrayed liberty was by depicting it as a female figure. The female figure represented the goddess of liberty, who was seen as a symbol of hope and freedom. The artists used this motif to promote the idea of liberty and to inspire people to fight for their rights.

All of the above:
Therefore, all of the above options are correct. Artists of the time of French Revolution introduced the idea of liberty as a necessary and indispensable concept. They portrayed liberty as a female figure, which symbolized hope and freedom. The artists used their skills to spread revolutionary ideas and to inspire people to fight for their rights. Their artworks played a significant role in raising the consciousness of people towards the value of freedom.

Option d is correct