The correct answer is A. Wand.
A wand is a hand-held device for optically reading bar codes on goods, labels & shelves. It is a small, lightweight device that is typically held in one hand. The wand has a scanner on one end that is used to read the bar code. The scanner converts the bar code into a digital signal that is then sent to a computer or other device.
A touch tablet is a flat, interactive surface that is used to input data. It is typically used with a stylus or finger to select items on the screen. A touch tablet is not used to read bar codes.
A mouse is a small, handheld device that is used to control the cursor on a computer screen. It is typically moved around on a flat surface, such as a desk, to move the cursor. A mouse is not used to read bar codes.
A light pen is a pen-shaped device that is used to input data into a computer. It has a light sensor on the tip that is used to detect light from the computer screen. A light pen is not used to read bar codes.
None of the above options are correct. The correct answer is A. Wand.