R$-4\mathrm{.}9$ Give a big$-$Oh characterization, in terms of n$,$ of the running time of the example$1$ method shown in Code Fragment $4\mathrm{.}121/**$ Returns the sum of the integers in given array. $*/2$ public static int example$1($int$[]$ arr$)\{3$ int n $=$ arr.length, total $=0$; $4$ for $($int i$=0$; j