Code execution is a dynamic activity where the software is run to check its behavior, whereas reviews are a static technique. Reviews focus on inspecting the product, gathering feedback, and identifying discrepancies without actually running the software.

Setting up automated tests requires a significant initial investment in terms of time, effort, and resources. This includes selecting the right tools, writing the scripts, and maintaining them to adapt to changes in the application being tested.

UI (User Interface) Testing primarily deals with the testing of the visual elements, layouts, and interactive parts of an application. The main goal is to ensure that users have a seamless and consistent visual experience across different functionalities, and that all interactive elements respond as expected.

Network Transition testing focuses on verifying the app's performance and behavior when transitioning between different network conditions, such as moving from WiFi to 4G or experiencing signal drops. It ensures the app remains stable and functional during such changes.

Manual Testing is primarily executed without the intervention of any testing tools. In manual testing, testers execute test cases without using any automation tools. They follow the test steps, input the defined set of data, and compare the actual results with the expected ones, relying solely on human efforts.

Contract Acceptance Testing is performed to validate that the software developed aligns with the requirements specified in the contract between the client and the vendor. This ensures that client expectations and contractual obligations are met.

A bug that was previously fixed but reappears in later phases is typically assigned the status "Reopened." This indicates that the bug was once addressed but has resurfaced, requiring additional attention and potentially a more thorough fix.

As the number of automated test scripts in a suite grows, maintenance becomes more challenging. Any change in the application can result in a need to update many test scripts, making the process time-consuming. Additionally, as scripts grow, finding the cause of a failure can be like finding a needle in a haystack, leading to increased debugging time.

Interface testing is specifically designed to ensure that the interaction between different software applications occurs smoothly. It verifies that communication processes are functioning as expected when the software system interfaces with other software systems or hardware components. Performance and load testing focus on system's performance metrics, while security testing checks vulnerabilities.

Keyboard navigation is a fundamental aspect of accessibility testing because many users, especially those with motor disabilities, might not be able to use a mouse or touch screen effectively. Ensuring that all functionalities of a web application are accessible via keyboard ensures that the app or website is usable by a wider range of users, thereby enhancing its overall accessibility.