Which of the following is not an advantage of client$/$server computing over centralized mainframe computing?

There is less risk that a system will completely malfunction because backup or mirror servers can pick up the slack if one server goes down.

Client$/$server networks are less vulnerable, in part because the processing load is balanced over many powerful smaller computers rather than concentrated in a single huge computer.

It is casy to expand capacity by adding servers and clients.

Each client added to the network increases the network's overall capacity and transmission speeds.