Which of the following statement is False?

Packet switching uses bandwidth more efficiently because channels are shared among many users.

So, option (a) is true.

In packet switching, packets may follow different paths and may face different queueing delays.

So, delay variation is more in packet switching.

Circuit switching has a dedicated path, so delay variation is usually less.

Therefore, option (b) is false.

Packet switching can support different bit rates and formats using store-and-forward technique.

So, option (c) is true.

Packet switching may cause packet reordering if packets take different paths.

So, option (d) is true.