The function $\text{f}$ is such that $0<\text{f}(x)<1$ for $0\le x\le 1$.

The trapezium rule with $n$ equal intervals is used to estimate ${\int }_0^1\text{f}(x)\text{d}x$ and produces an underestimate.

Using the same number of equal intervals, for which one of the following does the trapezium rule produce an overestimate?