Suppose you are trying to get a good estimate of √x using Newton Iteration, as described in project 2. The instructions are to continue iterating until the estimate of the square root of x is within a relative error of 0.01. Which of the following while loops should be used?
1) while(Math.abs(r - x) ≥ 0.001)
2) while(Math.abs(r - x) / x ≥ 0.001)
3) while(Math.abs(r * r - x) / x != 0.001)
4) while(Math.abs(r * r - x) / x > 0.001)