Which of the following statements are true about the development$/$test$/$stage$/$production deployment tier?Each correct answer represents a complete solution. Choose two.This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option.Aoption AIt is a four$-$tiered architecture.Boption BThere is no space or time to keep and manage a separate testing environment.Coption CIt is used in companies with agile software development practices.Doption DSoftware is tested by QA or testing engineers on a test environment using black$-$box techniques.