Which one of the following is the major difference between single mode and multi mode fibers?

Which one of the following is the major difference between single mode and multi mode fibers? Correct Answer Core diameter

The major difference between single mode fibre and multi-mode fibre is that the core diameter of single mode fibre is of the same order of magnitude as the wavelength of the light source (laser diode). Pulse dispersion is reduced in single mode fiber.
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