Explanation:

The main advantages of laser printers are speed, precision and economy. A laser can move very quickly, so it can "write" with much greater speed than an ink jet. And because the laser beam has an unvarying diameter, it can draw more precisely, without spilling any excess ink.

• Laser printer are those printers that uses laser and electrical charge to print text or images onto paper. A semiconductor diode laser is currently used in laser printers as the light source. It emits NIR light at around 800 nm wavelengths.

• However, the first laser printers used helium-neon lasers, but recently the use of visible diode lasers has become prevalent. These types of printers are very popular type of personal computer printers.

Hence option 3rd is correct.