what order?

When you start up a CDB, which operations are performed automatically and in what order?
a – The instance is started.
b – Control files are opened.
c – The root container is opened (redo logs and root data files).
d – Seed pluggable database is in READ ONLY mode.
e – Other PDBs are still in MOUNTED mode.
f – Triggers may fire if they exist to open other PDBs.

A.
a, b, c, d, e, f

B.
b, c, a, d, e, f

C.
c, b, a, d, f, e

D.
a, b, c, d

E.
b, c, a, d