Which statement is true about Cisco IOS XR commit command?

Which statement is true about Cisco IOS XR commit command?
A . The commit force command merges the target configuration with the running configuration and commits only valid changes
B . The commit replace command applies all the changes of the file configuration that were loaded previously. The final configuration applied is the merged configuration between the previous running configuration and the file configuration loaded
C . The commit confirmed 30 command applies the changes, however it initiates a configuration rollback after 30 seconds
D . The rollback configuration to ID08252015 command and commit command completely replaces the running configuration with the target configuration specified in the file name as ID08252015

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Answer: C