Which statement is true about using OPatch to patch Oracle Grid Infrastructure 12c? 

Answer options:

A. All grid infrastructure patches may be applied in a rolling fashion with Opatch.
B. Opatch can patch all cluster nodes simultaneously without stopping the clusterware on all nodes.
C. Opatch can patch all cluster nodes simultaneously only for nonrolling patches.
D. Applying patches with Opatch must be done in an out-of-place fashion.

A

As with standard upgrades to Oracle Grid Infrastructure, at any given point in time for normal operation of the cluster, all the nodes in the cluster must have the same software release and patch level. Because one-off patches can be applied as rolling upgrades, all possible patch levels on a particular software release are compatible with each other. Note: Starting with Oracle Grid Infrastructure 12c Release 1 (12.1), a new cluster state called "Rolling Patch" is available. This mode is similar to the existing "Rolling Upgrade" mode in terms of the Oracle ASM operations allowed in this quiesce state. References: https://docs.oracle.com/database/121/CWLIN/procstop.htm#CWLIN528