1z0-071 Oracle Database 12c SQL 第65题 the steps for a correlated subquery

Q65. The following are the steps for a correlated subquery, listed in random order:
1. The WHERE clause of the outer query is evaluated.
2. The candidate row is fetched from the table specified in the outer query.
3. The procedure is repeated for the subsequent rows of the table, till all the rows are processed.
4. Rows are returned by the inner query, after being evaluated with the value from the candidate row in the outer query.
Identify the option that contains the steps in the correct sequence in which the Oracle server evaluates a correlated subquery.
A. 4, 2, 1, 3
B. 4, 1, 2, 3
C. 2, 4, 1, 3
D. 2, 1, 4, 3

Correct Answer: C
Explanation/Reference:
References:
http://rajanimohanty.blogspot.co.uk/2014/01/correlated-subquery.html