What is automation testing:
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Automation testing is the process of developing and executing tests that can run unattended
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Automation testing is the process of developing and executing tests that can run with manual intervention
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All testing procedures are called automation testing
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Automation testing is the process of developing and executing tests that can be run by testers
The defining characteristic of automated testing is that tests execute without human intervention during the run - you write the test once, and it runs repeatedly unattended. Option A correctly states this key feature. Option B is wrong because manual intervention contradicts automation. Option C is too broad - not all testing is automated. Option D is incorrect because automation's purpose is to eliminate the need for testers to manually run each test. Option A is correct.