__author__ = 'Devesh Bajpai'

'''
https://codeforces.com/problemset/problem/1398/A

Solution: 
'''


def solve(n, arr):

    if arr[0] + arr[1] > arr[n-1]:
        return -1
    else:
        return "1 2 " + str(n) #1-indexed result


if __name__ == "__main__":

    t = int(raw_input())

    results = list()
    for _ in xrange(0, t):
        n = int(raw_input())
        arr = map(int, raw_input().split(" "))
        results.append(solve(n, arr))

    for result in results:
        print result
