Which statement is true about the ALTER SESSION SET CONTAINER command to switch between containers?

Which three statements are true about the database instance startup after an instance failure?

Examine the RMAN command:
RMAN> BACKUP VALIDATE DATABASE;
Which statement is true about the execution of the command?

You must unload data from the orders, order_items, and products database tables to four filesusing the External Tables.
CREATE TABLE orders_ext
(order_id, order_date, product_id, product_name,quantity)
ORGANIZATION EXTERNAL ( TYPE ORACLE_DATAPUMP DEFAULT DIRECTORY ext.dir LOCATION ('ordersl.dmp','orders2.dmp','orders3.dmp','lorders4.dmp') ) PARALLEL AS SELECT o.order_id,o.order_date,p.product_id,p.product_name,i.quantity FROM orders o,productsp,order_itemsi WHERE o.orderjd = i.order_id and i.product_id = p.product_id;
You execute the command shown in the Exhibit, but only two files are created. Which parameter must be changed so that four files are created?

Your database is running in ARCHIVELOG mode. Complete database backups are performed daily at midnight. A user accidentally truncates an important table at 10 AM after the last backup. After that, a few important transactions are performed on the database.
Which two best methods for recovering the truncated table data? (Choose two.)