In a step-index optical fiber used for telecommunications, which of the following conditions must be satisfied by the refractive index of the core (n1) and the cladding (n2) to ensure efficient light propagation, and what is its primary reason?

Options:

• A: n1
• B: n1 = n2; to maintain a uniform speed of light throughout the fiber.
• C: n1 > n2; to prevent light from escaping by ensuring total internal reflection occurs at the core-cladding interface.
• D: n1 > n2; to increase the speed of light as it enters the cladding.

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