Which of the following pairs of acronyms and their expansion is incorrectly matched?

USB actually stands for Universal Serial Bus, so pairing it with Universal Secure Bus is the wrong match.

USB is the standard interface for connecting peripherals and transferring data and power.

ROM correctly expands to Read Only Memory, storage whose contents are fixed and not normally overwritten.

WAN correctly expands to Wide Area Network, a network spanning large geographic distances.

OMR correctly expands to Optical Mark Reader, a device that reads marks on paper such as answer sheets.

The middle word in USB is Serial, describing how the bus sends data one bit after another.