A class Tach has a method rpm() that returns an integer. Consider the following

Question

A class Tach has a method rpm() that returns an integer. Consider the following method from the same class.

// precondition: 0 < caution < danger
// postcondition: return "green" if rpm is less than caution;
// return "yellow" if rpm is greater than or equal to caution and
// less than danger
// return "red" if rpm is greater than or equals to danger
public string indicator(int caution, int danger)
{
// missing code
}
The method indicator is intended to return "green" if rpm() returns a value less than caution, to return "yellow" if rpm()returns a value greater than or equal to caution and less than danger, to return "red" if rpm()returns a value greater or equal to danger.Consider the following replacement for //missing code.

I. if(rpm() < caution)
return "green";
else if(caution <= rpm() < danger)
return "yellow";
else
return "red";

II. if(rpm() < caution)
return "green";
if(rpm() >= danger)
return "red";
return "yellow";

III. if(rpm() < caution)
return "green";
else if(rpm() >= danger)
return "red";
else
return "yellow";

Which of these replacements for //missing code would make the method indicator work as intended?

Explanation / Answer

II and III

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