Explanation
Correct code block:
transactionsDf.select(["transactionId", "predError", "value", "f"])
The DataFrame.select returns specific columns from the DataFrame and accepts a list as its only argument.
Thus, this is the correct choice here. The option using col(["transactionId", "predError",
"value", "f"]) is invalid, since inside col(), one can only pass a single column name, not a list. Likewise, all columns being specified in a single string like "transactionId, predError, value, f" is not valid syntax.
filter and where filter rows based on conditions, they do not control which columns to return.
Static notebook | Dynamic notebook: See test 2