To define what columns should be displayed in an SQL SELECT statement:

Solution (By Examveda Team)

Option A: use FROM to name the source table(s) and list the columns to be shown after SELECT. - This option is incorrect. The "FROM" clause is used to specify the table(s) from which data is retrieved, not to define columns to be displayed.
Option B: use USING to name the source table(s) and list the columns to be shown after SELECT. - This option is incorrect. The "USING" clause in SQL is used for specifying columns for join conditions, not for selecting columns to display.
Option C: use SELECT to name the source table(s) and list the columns to be shown after USING. - This option is incorrect. The "SELECT" keyword is used at the beginning of a query to specify the columns or expressions to be retrieved, not to name tables or specify columns after "USING".
Option D: use USING to name the source table(s) and list the columns to be shown after WHERE. - This option is incorrect. The "USING" keyword in SQL is not used to list columns to be displayed in a SELECT statement.
Conclusion:
To define what columns should be displayed in an SQL SELECT statement, you use the Option A: use FROM to name the source table(s) and list the columns to be shown after SELECT. This means you specify the columns to display immediately after the "SELECT" keyword, not after "FROM" or "USING". Therefore, the correct answer is Option A.