Answer: SINGLE=TRUE

The question asks which COPY INTO command option writes data to a single file. According to Snowflake documentation and the community discussion, the SINGLE=TRUE parameter is specifically designed for this purpose - it forces the COPY INTO command to output all data into a single file regardless of the data size. The other options are invalid: MAX_FILE_NUMBER=1 and FILE_NUMBER=1 are not valid COPY INTO parameters, and MULTIPLE=FALSE is also not a recognized parameter. The community discussion shows 100% consensus on option A with multiple users confirming this is correct and referencing the official Snowflake documentation.

Author: LeetQuiz Editorial Team