Which of the following is not an advantage of LED?

The correct answer is option 1):(The ends of the LEDs get rusty)

Concept:

LED

• An LED is a heavily doped P-N junction diode which under forward biased condition emits spontaneous radiations and the wavelength of these radiations falls under wavelength in the visible spectrum.
• When the electric current passed through the LED then the electrons recombine with the holes present in the diode and hence LED emits the light.
• The amount of light emitted will depend on the rate of doping, the diode allows the flow of current only when it is forward biased
• Hence, the LED has to be forward biased and heavily doped.
• Longer life than other electrical light equipment
• It Emits monochromatic light 
• Environment friendly 
• LEDs are always cold
• There is no filament in LEDs
• LED ends wont get rusty.So option 1 is wrong