t = int(input())
 
for _ in range(t):
    n = int(input())
    array = list(map(int, input().split()))
    
    a1 = array[0]
    a2 = array[1]
    a3 = array[-1]
    
    if a3 > a1 + a2:
        q = " ".join(map(str, [1, 2, len(array)]))
        print(q)
    else:
        print(-1)
