Which has the highest speed of nerve impulse?

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Question

(A) The speed of a nerve impulse is significantly higher in medullated (myelinated) nerve fibers compared to non-medullated (unmyelinated) nerve fiber

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Medullated nerve

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(A) The speed of a nerve impulse is significantly higher in medullated (myelinated) nerve fibers compared to non-medullated (unmyelinated) nerve fibers.In medullated nerve fibers,the impulse travels via saltatory conduction,where the action potential jumps from one node of Ranvier to the next.This process makes the transmission of the nerve impulse approximately $20$ times faster than in non-medullated nerve fibers,where the impulse must travel along the entire length of the axon membrane.

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