Point out the correct statement?

Question

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An environment is a collection of (symbol, value) pairs, i.e. x is a symbol and 3.14 might be its value

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If the value of a symbol is not found in the environment in which a function was defined, then the search is continued in the child environment

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After the top-level environment, the search continues down the search list until we hit the parent environment

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Dynamic scoping turns out to be particularly useful for simplifying statistical computations

Q. Point out the correct statement?