Electromagnetic spectrum — practice question

Infrared laser light is employed to transmit data through optic fibres. What is a typical wavelength for infrared radiation?

• A$5 \times 10^{-5}\,\text{m}$
• B$5 \times 10^{-7}\,\text{m}$
• C$2 \times 10^{-9}\,\text{m}$
• D$2 \times 10^{-11}\,\text{m}$