Specifically mentioned in Snowflake Documentation: "Output files are always encoded using UTF-8, regardless of the file format; no other character sets are supported." https://docs.snowflake.com/en/user-guide/intro-summary-unloading#:~:text=File%20encoding,sets%20are%20supported.
To me both BCD looks right.
Regarding B you can use a file format for unloading (https://docs.snowflake.com/en/user-guide/data-unload-prepare.html)
And you can use ENCODING to change it https://docs.snowflake.com/en/sql-reference/sql/create-file-format.html
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