Which two are true about packages?

Variables and cursors defined in a package specification are visible to all subprograms in the same schema that has the package.

Modifications to a packaged procedure's body automatically cause recompilation of subprograms that invoke the procedure.

Package specifications can be compiled without their bodies.

Standalone subprograms that reference a package can be compiled only after both the package specification and body are compiled.

A package definition must have a specification and body.