How to check the Grid Infrastructure version

How to check the Grid Infrastructure version

[root@DELLDB ~]#  crsctl query crs activeversion
Oracle Clusterware active version on the cluster is [11.2.0.4.0]

[root@DELLDB ~]#   crsctl query crs releaseversion 
Oracle High Availability Services release version on the local node is [11.2.0.3.0]

[root@DELLDB ~]#    crsctl query crs softwareversion
Oracle Clusterware version on node [DELLDBrac1] is [11.2.0.4.0]

What does crsctl query crs activeversion mean ?
If some nodes become unreachable in the middle of an upgrade, then you cannot complete the upgrade, because the upgrade script (rootupgrade.sh) did not run on the unreachable nodes. Because the upgrade is incomplete, Oracle Clusterware remains in the previous release version.

What does crsctl query crs releaseversion mean ?
Use the crsctl query crs releaseversion command to display the version of the Oracle Clusterware software stored in the binaries on the local node.

What does crsctl query crs softwareversion mean ?
Use the crsctl query crs softwareversion command to display latest version of the software that has been successfully started on the specified node.