import sys
import math
from math import *
from collections import Counter,defaultdict
from io import BytesIO, IOBase
from collections import deque
import bisect

def main():
	n = int(input())
	arr = list(map(int, input().split()))
	
	if arr[0]+arr[1]>arr[-1]:
		print(-1)
	else:
		print(1,2,n)




for i in range(int(input())):
	main()