#include <bits/stdc++.h>
using namespace std;
int main() {
  int x;
  cin >> x;
  while (x--) {
    int y, flag = 0, b, c;
    cin >> y;
    int a[y];
    for (int i = 0; i < y; i++) cin >> a[i];
    int t = a[0];
    for (int i = 0; i < y; i++) {
      if (t + a[i] <= a[i + 1] || t + a[i + 1] <= a[i]) {
        b = i;
        c = i + 1;
        flag = 1;
      }
    }
    if (flag == 1)
      cout << '1' << " " << b + 1 << " " << c + 1 << endl;
    else
      cout << "-1" << endl;
  }
}
