Answer: Option(b) is correct
Explanation:
Beta-testing id the testing that is done on products in marketing and business field.Any new product's prototype is exposed to real users or consumer in the form of sample before releasing it in market.These users provide review and errors of the product after usage.
According to the question,a new product after being tested in in-house testing in company should be tested in the real environment and product user.Thus, the test that should be followed after prototype testing is beta-testing.
Other options are incorrect because concept testing,commercialization, market strategy and analysis of business process should not be followed after in-house testing .Thus, the correct option is option(b).