The correct answer is option 3: Virus. Rinderpest disease is a highly contagious viral disease that affects cattle and other cloven-hoofed animals. It is caused by the Rinderpest virus, which belongs to the family Paramyxoviridae. The virus spreads through direct contact between infected animals or through contaminated objects such as equipment or feed. It primarily affects the gastrointestinal and respiratory systems of cattle, causing symptoms such as high fever, nasal and eye discharge, diarrhea, and ulcers in the mouth and digestive tract. Rinderpest has been responsible for devastating outbreaks throughout history, resulting in high mortality rates and significant economic losses in affected regions. Fortunately, the disease has been successfully eradicated globally through vaccination efforts.