Explain the definitions of the phrases mistake, fault, and failure in plain and simple English. What, exactly, is a test oracle, and how does it function in the real world? What is it that is being...

Explain the definitions of the phrases mistake, fault, and failure in plain and simple English. What, exactly, is a test oracle, and how does it function in the real world? What is it that is being put to the test exactly? What is the significance of this development, and who is to be blamed for this development?