When must the declaration of a cursor include the FOR UPDATE OF clause?
A.
when the cursor is restarted using OPEN CURSOR with the WHERE CURRENT OF clause
B.
when a DELETE is performed against a position of the cursor using the WHERE CURRENT OF clause
C.
when an UPDATE is performed against a position of the cursor using the WHERE CURRENT OF
clause
D.
when any operation is performed against a position of the cursor using the WHERE CURRENT OF
clause