【多选题】
A <{p}>They can be created only in CDB$ROOT.<{br/}><{/p}>
B <{p}>They can be only metadata-linked in an application container.<{br/}><{/p}>
C <{p}>They can exist in user-defined schemas only in application containers.<{br/}><{/p}>
D <{p}>They can exist in CDB$ROOT and an application root.<{br/}><{/p}>
E <{p}>They can be extended data-linked in CDB$ROOT.<{br/}><{/p}>
F <{p}>They can be created only in an application root<{br/}><{/p}>
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