public static String concatenate3(char[][] a) { int n = a.length; StringBuilder sb = new StringBuilder(); for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) sb.append (a[i][j]); %3D %3! return sb.toString(); O(n) O e(n²) O e(n² log n) O e(n³) O e(n*)

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