Which three statements are true about Oracle Clusterware components, architecture, and behavior? 

Answer options:

A. The Cluster Ready Services Daemon (CRSD) is responsible for monitoring and maintaining the availability of cluster resources defined in the Oracle Local Repository file (OLR).
B. All cluster nodes can write or read from the Oracle Clusterware Repository (OCR) file at the same time.
C. The Oracle High Availability Services Daemon (OHASD) is responsible for monitoring and maintaining the availability of the Clusterware stack on a cluster node.
D. Voting disks stored in Automatic Storage Management (ASM) can be discovered or used even if the ASM instance on a cluster node is down.
E. The Cluster Synchronization Services Daemon (CSSD) must connect to the cluster by accessing the Oracle Clusterware Repository (OCR) file before the Oracle High Availability Services Daemon (OHASD) is started.
F. Time synchronization in an Oracle Cluster is possible without using network Time Protocol (NTP).

CDF

F: To activate CTSS in your cluster, you must stop and deconfigure the vendor time synchronization service on all nodes in the cluster. CTSS detects when this happens and assumes time management for the cluster. For example, to deconfigure NTP, you must remove or rename the ntp.conf file. Incorrect Answers: A: The CRS daemon (crsd) manages cluster resources based on the configuration information that is stored in OCR, not the OLR, for each resource. B: You must update OCR through supported utilities such as Oracle Enterprise Manager, the Oracle Clusterware Control Utility (CRSCTL), the Server Control Utility (SRVCTL), the OCR configuration utility (OCRCONFIG), or the Database Configuration Assistant (DBCA) E: Please refer to the cluster startup picture below. 

References: https://docs.oracle.com/cd/E11882_01/rac.112/e41959/intro.htm#CWADD90955