A. Confirmation testing and Regression testing are both testing fixes to a set of defects.

B. Confirmation testing is testing to establish whether any defects have been introduced as a result of changes and Regression testing is testing fixes to a set of defects.

C. Confirmation testing is testing fixes to a set of defects and Regression testing is testing to establish whether any defects have been introduced as a result of changes.

D. Confirmation testing and Regression testing are both testing to establish whether any defects have been introduced as a result of changes