Riemann Sums Question 2

The graph of the function \(f\) is shown above for \(0\leq x \leq 2\). Of the following, which has the least value?

\(\int\limits_1^2 f(x) dx\)

Left Riemann sum approximation of \( \int\limits_1^2 f(x) dx\) with 4 subintervals of equal length

Right Riemann sum approximation of \( \int\limits_1^2 f(x) dx\) with 4 subintervals of equal length

Midpoint Riemann sum approximation of \( \int\limits_1^2 f(x) dx\) with 4 subintervals of equal length