In a clustered environment, data is placed on the shared storage, and identities between peers are equal and have the same access to the dat a. It is…

In a clustered environment, data is placed on the shared storage, and identities between peers are equal and have the same access to the dat a. It is required that the clusterware have a control mechanism for concurrent access to such peer permissions. In Oracle RAC, you use the _____ mechanism to do multiple node-to-node collisions control of access.