Which of the following would BEST support immediate rollback of the failed fix?

An internal application has been developed to increase the efficiency of an operational process of a global manufacturer. New code was implemented to fix a security bug, but it has caused operations to halt. The executive team has decided fixing the security bug is less important than continuing operations.

Which of the following would BEST support immediate rollback of the failed fix? (Choose two.)
A . Version control
B . Agile development
C . Waterfall development
D . Change management
E . Continuous integration

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Answer: D