from sys import stdin, stdout
import heapq
import cProfile
from collections import Counter, defaultdict, deque
from functools import reduce
import math


def get_int():
    return int(stdin.readline().strip())


def get_tuple():
    return map(int, stdin.readline().split())


def get_list():
    return list(map(int, stdin.readline().split()))


def solve():
    n = get_int()
    ls = get_list()
    if ls[0]+ls[1]<=ls[-1]:
        print(1,2,n)
    else:
        print("-1")




def main():
    solve()


TestCases = True

if TestCases:
    for i in range(get_int()):
        main()
else:
    main()
