Which Two Statements Are Considered Best Practices According to the 12-Factor

Which two statements are considered best practices according to the 12-factor app methodology for application design? (Choose two.)

A) Application code writes its event stream to stdout.
B) Application log streams are archived in multiple replicated databases.
C) Application log streams are sent to log indexing and analysis systems.
D) Application code writes its event stream to specific log files.
E) Log files are aggregated into a single file on individual nodes.