Which two commands allow you to return to a previous version of software on the device？（）

A. request sytem software add

B. request sytem software downgrade

C. request sytem software replace

D. request sytem software rollback

A．rollback

B． delete

C． delete 0

D． rollback 0

Flashback is enabled for your multitenant container database (CDB), which contains two pluggable database (PDBs). A local user was accidently dropped from one of the PDBs.You want to flash back the PDB to the time before the local user was dropped. You connect to the CDB and execute the following commands:SQL ＞ SHUTDOWN IMMEDIATE SQL ＞ STARTUP MOUNT SQL ＞ FLASHBACK DATABASE to TIME TO_DATE (‘08/20/12’ , ‘MM/DD/YY’)”;Examine following commands:1. ALTER PLUGGABLE DATABASE ALL OPEN;2. ALTER DATABASE OPEN;3. ALTER DATABASE OPEN RESETLOGS;Which command or commands should you execute next to allow updates to the flashback back schema？（）

A. Only 1

B. Only 2

C. Only 3

D. 3 and 1

E. 1 and 2

A. show bgp group

B. show bgp status

C. show bgp summary

D. show bgp neighbor

E. show protocols bgp

A. show ip route ospf

B. show ospf routes

C. show route protocol ospf

D. show route

A.A

B.B

C.C

D.D

E.E

F.F

A.show ip ospf

B.show ip protocols

C.show ip ospfneighbor

D.show ip ospfinterface

A.Encryption

B.Bandwidth limits

C.Minimal signal loss

D.No EMI

A.Encryption

B.Minimal signal loss

C.Bandwidth limits

D.No EMI

A. show chassis hardware

B. show chassis temperature-thresholds

C. show chassis pic fpc-slot ＜value＞ pic-slot ＜value＞

D. show chassis environment