How Is General Ledger Updating Accomplished by the Various Accounting

How is general ledger updating accomplished by the various accounting subsystems?

A) Individual journal entries for each accounting subsystem transaction update the general ledger every 24 hours.
B) Summary journal entries that represent the results of all transactions for a certain time period are used to update the general ledger.
C) The controller or treasurer must approve accounting subsystem journal entries before any updating may occur.
D) Nonroutine transactions are entered into the system by the treasurer's office.