Which aspect of a FIFA agent's work is regulated by FIFA?

FIFA agents, also known as intermediaries, operate under a specific set of regulations established by FIFA to ensure proper conduct and representation within the football industry. The conduct and representation processes that FIFA regulates include the ethical conduct expected from agents, how they engage with players and clubs, and the formal procedures for representing clients in transfers and negotiations. This is crucial in maintaining the integrity of football and in protecting the interests of all parties involved, including players, clubs, and the leagues.

While other aspects like travel expenses, marketing, and player training regimes are significant in the broader business of football, they do not fall under FIFA's direct regulatory framework. The regulation of agents’ conduct helps to establish standards that agents must adhere to, including the need for transparency and fairness in their dealings, which are pivotal for fostering a healthy football environment. Thus, the correct answer highlights the area of agent activity that FIFA specifically oversees to maintain professional standards within the industry.