MOD = 1000000007
from collections import defaultdict as dd,Counter,deque

def si(): return input()
def ii(): return int(input())
def li(): return list(map(int,input().split()))
def mi(): return map(int,input().split())
def out(v): print(v)
def spout(): print(v,end=" ")
def d2b(n): return bin(n).replace("0b","")
def twod(n,m,num):return [[num for x in range(m)] for y in range(n)]
def vow(): return ['a','e','i','o','u']
def let(): return [chr(i) for i in range(97,123)]
def gcd(x, y):
    while y:
        x, y = y, x % y
    return x
def ispow2(x):
    return (x and (not(x & (x - 1))))
def prime_factors(n):
    i = 2
    factors = []
    while i * i <= n:
        if n % i: i+=1
        else:
            n //= i
            factors.append(i)
    if n > 1: factors.append(n)
    return (list(factors))
    
    
t=ii()
while t:
    t-=1
    n=ii()
    a=li()
    if a[-1]>=a[0]+a[1]: print(1,2,n)
    else: print(-1)