When should you change engine oil?

What this question teaches

For the question "When should you change engine oil?", the correct answer is "Before driving or after the engine section has cooled down." because it is the option that best matches the traffic rule or safest action being tested in this question; the other choices such as "Every time when you sent your vehicle to car shop for service." and "Immediately after driving and stopping your car." do not fit the rule as well.