Step 1: Concept:
Look at the action words in the question: identify hazards, assess the chance of each hazard, define controls. These three actions together are the working steps of one named system.
Step 2: Recall:
The system that studies each step of the food chain for hazards and then fixes control points is called HACCP. GMP and GHP are the support rules (clean premises and personal hygiene) that must be in place before HACCP works well.
Step 3: Test each option against the action words:
GMP: gives production rules, no hazard assessment. GHP: gives hygiene rules, no hazard assessment. ISO: is a standards body, not a method. HACCP: analyses hazards and sets control points.
Step 4: Use the passage:
The last sentence of the passage describes HACCP as an approach where raw materials and every step are studied for their chance of causing food hazards. The question repeats this idea.
Step 5: Conclusion:
Only option 4 can be defended on all three action words.
Final Answer:
Hazard study at every stage with control measures is HACCP, option 4.
\[ \boxed{4} \]