question shows below:

A factory produces a large number of products, of which 1/10 are faulty on average. A quality control test correctly identifies 8/10 of the faulty products and all of the flawless products. For every product that is identified as faulty, the test is run a second time, independently. Suppose that the product was identified as faulty in the first test and as flawless in the second test. What is the probability that the product is faulty? O 1/2 None of the other answers are correct O 1 321/1000 320/1000