What is true about them?

Evaluate these two SQL statements: SELECT last_name, salary, hire_date FROM
EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM
EMPLOYEES ORDER BY 2 DESC; What is true about them?

A.
The second statement returns a syntax error.

B.
There is no need to specify DESC because the results are sorted in descending order by
default.

C.
The two statements produce identical results.

D.
The two statements can be made to produce identical results by adding a column alias
for the salary column in the second SQL statement.