#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
int powm(int a, int b) {
  int res = 1;
  while (b) {
    if (b & 1) res = (res * a) % mod;
    a = (a * a) % mod;
    b >>= 1;
  }
  return res;
}
string trim(const string& str) {
  size_t first = str.find_first_not_of(' ');
  if (string::npos == first) {
    return str;
  }
  int last = str.find_last_not_of(' ');
  return str.substr(first, (last - first + 1));
}
int main() {
  std::ios::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  cout.precision(15);
  int t;
  cin >> t;
  while (t != 0) {
    t--;
    int n;
    cin >> n;
    int arr[n];
    for (int i = 0; i < n; i++) cin >> arr[i];
    if (arr[0] + arr[1] < arr[n - 1]) {
      cout << "1 "
           << "2 " << n << '\n';
    } else {
      cout << "-1" << '\n';
    }
  }
  cerr << "Time elapsed" << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
  return 0;
}
