Identify three valid methods of opening, pluggable databases (PDBs).（）

A

ALTER PLUGGABLE DATABASE OPEN ALL ISSUED from the root

B

ALTER PLUGGABLE DATABASE OPEN ALL ISSUED from a pdb

C

ALTER PLUGGABLE DATABASE PDB OPEN issued from the seed

D

ALTER DATABASE PDB OPEN issued from the root

E

ALTER DATABASE OPEN issued from that pdb

F

ALTER PLUGGABLE DATABASE PDB OPEN issued from another pdb

G

ALTER PLUGGABLE DATABASE OPEN issued from that pdb