And the correct answer is?

The following is from a text..... I would like some opinions .... what is the correct answer.

EMP Table is defined as follows:

EMPNO            NUMBER            4
ENAME            VARCHAR2        30
SALARY           NUMBER            14,2
COMM             NUMBER            10,2
DEPTNO            NUMBER            2

You perform the following tow queries:

1. SELECT empno enumber, ename FROM emp ORDER BY 1;
2. SELECT empno, ename FROM emp ORDER BY ASC;

Which of the following is true?

A. Statements 1 and 2 will produce the same result.
B. Statement 1 will execute; statement 2 will return an error.
C. Statement 2 will execute; statement 1 will return an error.
D. Statement 1 and 2 will execute but produce different results.