Final answer:
In Alexandre Dumas's novel, Monte Cristo exacts his revenge on Fernand by exposing his crimes, leading to Fernand's ruin.
Step-by-step explanation:
The student's question about how Monte Cristo exacts his revenge on Fernand is related to the plot of the novel “The Count of Monte Cristo” by Alexandre Dumas. Monte Cristo enacts his revenge on Fernand by exposing his crimes, which leads to the ruination of Fernand's reputation and contributes to his eventual downfall. This action by Monte Cristo is a calculated move to ensure that Fernand feels the weight of his misdeeds being brought to light.