Which command or commands should you execute next to allow updates to the flashback back schema?

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: 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.
1 and 2

B.
3 and 1

C.
Only 1

D.
Only 3

E.
Only 2