
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.StringTokenizer;

// take the input
// take the numbers which will be twice the size of the number input
// find the total no. of odds and evens in the array
// add evens and the odds separately in two different arraylist

public class edu93A {
	static public BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
	static public PrintWriter out = new PrintWriter(System.out);

	public static void main(String[] args) {
		FastScanner fs = new FastScanner();
		int T = fs.nextInt();
		for (int tt = 0; tt < T; tt++) {
			int n = fs.nextInt();
			int aee[] = fs.readArray(n);
			int a, b, c = 0;

			a = aee[0];
			b = aee[1];
			c = aee[n - 1];
			if (a + b > c)
				out.println(-1);
			else
				out.println(1 + " " + 2 + " " + n);

		}
		out.close();

	}

	static void sort(int[] a) {
		ArrayList<Integer> l = new ArrayList<>();
		for (int i : a)
			l.add(i);
		Collections.sort(l);
		for (int i = 0; i < a.length; i++)
			a[i] = l.get(i);
	}

	static class FastScanner {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer("");

		String next() {
			while (!st.hasMoreTokens())
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		int[] readArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}

		long nextLong() {
			return Long.parseLong(next());
		}
	}

}
