Required information

Below is short$-$run cost data for four different plant sizes. Plant $2$ has exactly twice as many inputs as does Plant $1.$ Plant $3$ has exactly three times as many inputs as does Plant $1$ and Plant $4$ has exactly four times as many inputs as does Plant $1.$

$\backslash$table$[[$Output$,$$ AC: Plant $1,4$ AC: Plant $2,$$ AC: Plant $3,$$ AC: Plant $4],[5,12,14,15,15\mathrm{.}25],[10,11,13,13\mathrm{.}75,14\mathrm{.}25],[15,12,12,12\mathrm{.}75,14],[20,14,11,12,13],[25,17,12,11\mathrm{.}50,12\mathrm{.}20],[30,21,13,11,11\mathrm{.}70],[35,26,14,11\mathrm{.}50,11\mathrm{.}30],[40,32,17,12,11],[45,39,21,12\mathrm{.}75,11\mathrm{.}30],[50,47,25,13\mathrm{.}75,11\mathrm{.}70]]$

Refer to the information above to answer this question. Which of the following statements about the shape of the LRAC curve is correct?