View the Exhibit and note the files available in the $ORACLE_HOME/dbs folder. The ASM instance is already running. You used the following steps to start the database instance and open the database: 
[oracle@edt4r4p1 dbs]$ echo $ORACLE_SID
orcl
[oracle@edt4r4p1 dbs]$ sqlplus
SQL*Plus: Release 11.1.0.6.0 - Production on Tue Oct 16 15:35:43 2007
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Enter user-name: sys/oracle as sysdba
Connected to an idle instance.
SQL> STARTUP
ORACLE instance started.
......
Which file is used to start the instance in this case?
A.init.ora
B.spfile.ora
C.initorcl.ora
D.spfile+ASM.ora
这里考察的是数据库启动时读取配置文件的顺序：
Spfile<sid>.ora => spfile.ora => init<sid>.ora