Which operator is used to concatenate two strings?

A/An ________ is an application that can serve as an INTERMEDIARY for connecting with other computers.

A. proxy server B. application server C. call manager D. security server

 A ____ is a visual display that responds to the touch your finger, hand, stylus, or digital pen to enter data and commands.

A. touchpad B. platter C. touch screen D. touch screen