t=int(input())
while(t):
    n=int(input())
    l=list(map(int,input().split()))
    a=l[0]+l[1]
    b=l[-1]
    if(a<=b):
        print(1,2,n)
    else:
        print(-1)

    t-=1

c81dc2acb4522ee556e6e4123d83c6478cd91e9e
<mask token>

<mask token>
while t:
    n = int(input())
    l = list(map(int, input().split()))
    a = l[0] + l[1]
    b = l[-1]
    if a <= b:
        print(1, 2, n)
    else:
        print(-1)
    t -= 1

t = int(input())
while t:
    n = int(input())
    l = list(map(int, input().split()))
    a = l[0] + l[1]
    b = l[-1]
    if a <= b:
        print(1, 2, n)
    else:
        print(-1)
    t -= 1

t=int(input())
while(t):
    n=int(input())
    l=list(map(int,input().split()))
    a=l[0]+l[1]
    b=l[-1]
    if(a<=b):
        print(1,2,n)
    else:
        print(-1)

    t-=1
