Which two activities are performed during a successful start up operation?

The ORACLE_SID environment variable is set to +ASM. ASMLIB is not used in the
configuration. You executed the following command to startup the Automatic Storage
Management (ASM) instance.
SQL> STARTUP;
Which two activities are performed during a successful start up operation? (Choose two.)

A.
The databases configured to use the ASM instance are mounted

B.
The disk groups are mounted as per the ASM_DISKGROUPS initialization parameter

C.
ASM starts the Oracle Cluster Synchronization Services (CSS) daemon if it is not started

D.
ASM discovers and examines the contents of all files that are in the paths specified in the
ASM_DISKGROUPS initialization parameters

Explanation:
Refer to Starting Up an ASM Instance.
To start up an ASM instance, you must:
1. To connect to the ASM instance with SQL*Plus, you must set the ORACLE_SID
environment variable to the ASM SID.
2. The initialization parameter file, which can be a server parameter file, must contain:
INSTANCE_TYPE = ASM
3. The STARTUP command, tries to mount the disk groups specified by the initialization
parameter ASM_DISKGROUPS.
If ASM_DISKGROUPS is blank, the ASM instance starts and warns that no disk groups
were mounted. You can then mount disk groups with the ALTER DISKGROUP…MOUNT
command.
The Cluster Synchronization Services (CSS) daemon is required to enable synchronization
between ASM and its client database instances. The CSS daemon is normally started (and
configured to start upon reboot) when you use Database Configuration Assistant (DBCA) to
create your database. If you did not use DBCA to create the database, you must ensure that
the CSS daemon is running before you start the ASM instance.