The LED is usually made of materials like:(1 Point)GaAsC and SiGeAsNone of the above

The question asks about the materials commonly used to manufacture Light Emitting Diodes (LEDs).

LEDs are typically made from semiconductor materials. The most common materials used include:

1. Gallium Arsenide (GaAs): This is a specific type of semiconductor that is widely used in infrared LEDs and laser diodes.
2. Silicon (Si): While silicon is a fundamental semiconductor material, it is not typically used for light emitting but rather for electronic applications.
3. Germanium (Ge): Like silicon, it's primarily used in electronics but not commonly in LEDs.
4. Silicon-Germanium (SiGe): This is also generally used for electronic applications and not for light emission.
5. None of the above: This option is used when none of the given materials qualify as LED substrates.

Considering the primary materials for making LEDs, the correct answer is GaAs.

Thus, the final answer is:

Final Answer: GaAs