The correct answer is option 2 - electromagnetic waves.

Light waves are a type of electromagnetic wave. Electromagnetic waves are composed of changing electric and magnetic fields that oscillate perpendicular to each other and to the direction of propagation. These waves do not require a medium to travel through, unlike mechanical waves such as sound waves.

Option 1 - electro-mechanical waves - is incorrect because electro-mechanical waves do not exist. Mechanical waves, such as sound waves, require a medium to propagate, while light waves do not.

Option 3 - electro-optical waves - is also incorrect. While it may seem like a plausible answer, there is no such thing as electro-optical waves. This option suggests a combination of electrical and optical properties, which is not applicable to light waves.

Option 4 - magneto-optical waves - is also incorrect. Magneto-optical waves do exist but are different from light waves. Magneto-optical waves are a type of wave that exhibits a change in polarity when exposed to a magnetic field. Light waves, on the other hand, are not affected by magnetic fields.

In conclusion, light waves are classified as electromagnetic waves due to their electric and magnetic field properties, making option 2 the correct answer.