B- you do an update on a single column that has no index.
C- What Is the Recycle Bin?
The recycle bin is actually a data dictionary table containing information about dropped objects. Dropped tables and any associated objects such as indexes, constraints, nested tables, and the likes are not removed and still occupy space. They continue to count against user space quotas, until specifically purged from the recycle bin or the unlikely situation where they must be purged by the database because of tablespace space constraints.
To create an index in another schema, all of the following conditions must be true:
You have CREATE ANY INDEX system privilege.
The owner of the other schema has a quota for the tablespaces to contain the index or index partitions, or UNLIMITED TABLESPACE system privilege.
so E is not correct
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