A table named TAB_A was created with the COMPRESS YES option specified and populated with 100,000 rows. If a DBA wants to create an index on table TAB_A, which statement is true? 

In order for the index to be compressed, it must be enabled for compression by specifying the COMPRESS YES option with the CREATE INDEX statement that is used to create it. 

The index will automatically be compressed since the table it is associated with is compressed; the ALTER INDEX command does not have to be executed. 

In order for the index to be compressed, it must be enabled for compression by specifying the COMPRESS YES option in the CREATE INDEX statement used to create it; however, the index will not be compressed until the ALTER INDEX command is used to create an index compression dictionary. 

The index will automatically be enabled for compression because the associated table is compressed; however, the index will not be compressed until it is REORGed.