/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
public class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		while(t--!=0)
		{
		    int n=sc.nextInt();
		    int a[]=new int[n];
		    for(int i=0;i<n;i++)
		    {
		        a[i]=sc.nextInt();
		    }
		    if(a[0]+a[1]<=a[n-1])
		    {
		        System.out.println("1 2 "+n);
		    }
		    else
		    {
		        System.out.println("-1");
		    }
		}
	}
}
