Which two guidelines are recommended by Oracle to reduce invalidation of dependent objects?

Which two guidelines are recommended by Oracle to reduce invalidation of dependent objects? (Choose two.)
A. Reference tables indirectly by using views.
B. Reference tables directly avoid using views.
C. When adding new items to a package, add them to the end of the package.
D. When adding new items to a package, add them to the beginning of the package.

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