Which statement is true regarding confirmation testing and regression testing?

Confirmation testing confirms the quality of the test being run while regression testing ensures that the software still works after a change has been made.

Confirmation testing is an optional activity whilst regression testing is not negotiable.

Confirmation testing aims to verify that a defect has been resolved and regression testing ensuring that existing functionality still works after a change.

Testers' involvement is essential whilst running retesting and regression testing.

TESTER Involvement is essential whilst running retesting and regression testing.