Question $106\mathrm{.}7$ pts

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In the context of the given script, what does the set$\_$index method achieve when applied as below?

Group of answer choices

It sets the 'Year' column as the index of the 'merged$\_$data' DataFrame, allowing for index$-$based operations.

It permanently removes the 'Year' column from the 'merged$\_$data' DataFrame.

It sorts the 'merged$\_$data' DataFrame based on the 'Year' column.

It designates the 'Year' column as the primary key of the 'merged$\_$data' DataFrame for faster searches.