Vagueness about a question

http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=303&p_certName=SQ1Z0_146
Why the correct answers for the last question are BC, and not BD? Why also C? Because if we change the value for the parameter PLSQL_CODE_TYPE to INTERPRETED from the previously set value of NATIVE, then for all PL/SQL program units that were compiled as native, subsequent automatic recompilations would use interpreted compilation

Srini - I may be the cause of this confusion. This is the same OP that ask this question - Re: plsql_optimize_level and plsql_code_type
See my post there and the other question that was ask. The other question involved PLSQL_OPTIMIZE_LEVEL; this question doesn't change the level.
The OP may be trying to reconcile my response there (about a different question) with this new question.
It would help if you would explain how to reconcile the reference you gave in the database reference:
>
If a PL/SQL library unit is compiled native, all subsequent automatic recompilations of that library unit will use native compilation.
>
With the quote I used to answer the other question which was in the SQL Reference for 11R2 (PL/SQL Units and Compilation Parameters - http://docs.oracle.com/cd/E11882_01/appdev.112/e17126/overview.htm)
states:
>
If the optimization level (set by PLSQL_OPTIMIZE_LEVEL) is less than 2:
•The compiler generates interpreted code, regardless of PLSQL_CODE_TYPE.
>
Are you saying that once the optimization level is 2 or more you can never recompile a currently compiled package as INTERPRETED? Or are you saying that it will never be AUTOMATICALLY recompiled as INTERPRETED but can be manually recompiled as INTERPRETED?
If so then this would mean there is a difference between 'automatic' recompilation and 'non-automatic' (manual?) recompilation? Are there any other differences? Does that mean that automatic recompilation will not take 'conditional compilation' parameter settings into account?

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