Spectrophotometers Employ Various Sources of Light

Spectrophotometers employ various sources of light.Which of the following is NOT true for spectrophotometer light sources?

A) Tungsten lamps emit radiation over the visible spectrum and parts of the ultraviolet and infrared spectrums.
B) Dueterium arc lamps use controlled electric discharges to cause D₂ to dissociate and emit visible radiation.
C) Light emitting diodes emit narrow bands of visible and near-infrared radiation.
D) Lasers emit radiation of a single wavelength.
E) A silicon carbide globar emits infrared radiation when heated to near 1500 K.