I believe that the answer to the question provided above is that the process of verbal narration. By this the literature is shared across countries and culture easily.
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Answer:
Each conservation law of a given partial differential equation is determined (up to equivalence) by a function known as the characteristic. This function is used to find conservation laws, to prove equivalence between conservation laws, and to prove the converse of Noether's Theorem.
Explanation:
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The correct letter would be A. When conducting peer review, its best if you provide a positive and detailed explanation of what you liked and what you think could be improve, but also make sure to stay positive and kind!