正解:D
A sandbox is an isolated environment that allows for the testing of critical systems without the risk of them being negatively impacted by changes. A sandbox can be used to simulate real-worldscenarios, experiment with new features, debug errors, or evaluate the performance and security of a system. A sandbox can be created using virtualization, emulation, or containerization technologies. A sandbox prevents any changes made in the testing environment from affecting the production environment, which is the actual system that is used by the end users.
https://www.comptia.org/training/books/a-core-2-220-1102-study-guide