多选题Which two statements are true regarding a PL/SQL package body？（）AIt cannot be created without a package specification.BIt cannot invoke subprograms defined in other packages.CIt can contain only the subprograms defined in the package specification.DIt can be changed and recompiled without making the package specification invalid.
多选题
Which two statements are true regarding a PL/SQL package body？（）
A
It cannot be created without a package specification.
B
It cannot invoke subprograms defined in other packages.
C
It can contain only the subprograms defined in the package specification.
D
It can be changed and recompiled without making the package specification invalid.
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