You conned using SQL Plus to the root container of a multitenant container database (CDB) with SYSDBA privilege. The CDB has several pluggable databases (PDBs) open in the read/write mode. There are ongoing transactions in both the CDB and PDBs. What happens alter issuing the SHUTDOWN TRANSACTIONAL statement?（）

• A、The shutdown proceeds immediately. The shutdown proceeds as soon as all transactions in the PDBs are either committed or rolledhack.
• B、The shutdown proceeds as soon as all transactions in the CDB are either committed or rolled back.
• C、The shutdown proceeds as soon as all transactions in both the CDB and PDBs are either committed or rolled back.
• D、The statement results in an error because there are open PDBs.