Step 1: Understanding the Concept:
Farming can be classified in different ways.
The classification depends on the types of enterprises.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand farming systems.
Step 3: Detailed Explanation:
Specialized, diversified, mixed, and integrated farming are different systems of farming.
Specialized: only one enterprise.
Diversified: multiple enterprises.
Mixed: crops and livestock together.
Integrated: combining different enterprises.
Thus, these are examples of farming systems.
Step 4: Final Answer:
These are examples of system of farming.
Hence, the correct option is (A).