The correct answer is option 2: Cattle.

Foot and Mouth Disease (FMD) is a highly contagious viral disease that affects cloven-hoofed animals, such as cattle, pigs, sheep, and goats. It is caused by the Foot and Mouth Disease virus, which belongs to the Picornavirus family.

Option 1, Cats and Dogs, is incorrect. Although cats and dogs can contract and carry other diseases, they are not susceptible to Foot and Mouth Disease.

Option 3, Poultry, is also incorrect. Poultry, including chickens, ducks, and turkeys, do not get infected with Foot and Mouth Disease. They are instead susceptible to other diseases like Avian Influenza or Newcastle Disease.

Option 4, Humans, is incorrect. Foot and Mouth Disease is a disease that only affects animals and does not infect humans. However, humans can play a significant role in spreading the virus if they come in contact with infected animals or contaminated objects.

In conclusion, Foot and Mouth Disease is primarily found in cattle and other cloven-hoofed animals, and it is crucial to implement strict biosecurity measures to prevent its introduction and spread within animal populations.