A. CONCAT ('abc', 'test', 'drive')
This would output: "abc test drive"
B. 'abc'||'test'||'drive'
This would output: "abctestdrive"
C. abc, test, drive
This would not yield a single string, but rather a comma-separated list of three individual values.
D. CONCAT ('abc''test''drive')
This would output: "abc'test'drive"
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