The correct answer is option 1: Four.

Domestic animals such as cattle, buffalo, goat, and sheep have a unique digestive system that includes four chambers in their stomach. These four chambers are called the rumen, reticulum, omasum, and abomasum.

The rumen is the largest chamber in the stomach and is responsible for fermentation and breakdown of plant material. It contains billions of microorganisms that help in breaking down cellulose and other complex carbohydrates.

The reticulum is smaller and works with the rumen to sort out and regurgitate fibrous material, like cud, for the animals to chew again.

The omasum acts like a sponge, absorbing water and some nutrients from the partially digested food.

Finally, the abomasum is the true stomach, similar to the stomach of humans. It secretes digestive juices that further break down the food, allowing for absorption of nutrients.

It is important to note that the number of chambers in the stomach can vary among different animal species. In the case of cattle, buffalo, goat, and sheep, they have four chambers.