Which two statements are true about a server parameter file (SPFILE)? (Choose two.)
A. An SPFILE can be created from a PFILE or from memory.
B. A PFILE can be used to start up a database instance even if an SPFILE exists.
C. An SPFILE must reside in the ORACLE_HOME/dbs directory.
D. An SPFILE can be created only before a database instance is started.
E. An SPFILE contains only those dynamic parameters that can be changed without having to restart the database instance.