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