The trapezoidal method is used to evaluate the numerical value of $\int_{0}^{1}e^x dx$. Consider the following values for the step size h.
- 10^{-2}
- 10^{-3}
- 10^{-4}
- 10^{-5}
For which of these values of the step size h, is the computed value guaranteed to be correct to seven decimal places. Assume that there are no round-off errors in the computation.
- iv only
- iii and iv only
- ii, iii and iv only
- i, ii, iii and iv