Acceptance of deliverables to multiple locations requires which type of sign off？（）

A customer wants to increase the performance of an existing server. They are running a very network intensive application and feel that increasing the bandwidth to the network will fix their problem. 
They are running two 24-port autosensing 10/100 hubs， tied together with a standard Ethernet crossover cable in port 24. 
The server is running IPX. After adding a second network card and plugging one card into each hub， they have not seen any performance improvement. 
Which two are likely reasons why implementing network adapter teaming has not improved performance？（）