t=int(input())
for i in range(t):
    n=int(input())
    l=list(map(int,input().split()))
    if(l[-1]<l[0]+l[1]):
        print("-1\n")
    else:
        print("1 2",n,'\n')
      
    
        

    
                
        
        
        
    
        
