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A game company customer needs to build a real-time leaderboard. use Pu b/Sub to implement instant chat rooms, and deploy dynamic servers for the "Moments of Friends" released by newer players The account server is used to save basic user information, and the friend server is used to persistently store massive and complex player networks. Which of the following HUAWEI CLOUD database products can be used to meet these requirements? 

The cloud-native data lake solution in HUAWEI CLOUD MapReduce provides a leading architecture for separating storage and computing for unstructured data scenarios such as massive government images and videos. Use OBS on the cloud to replace MRS local storage as a big data store. The following description of the OBS service in this solution, which one is wrong? Single selection

During the research stage of business migration to the cloud enterprises need to collect source-end system information. The following description of the source information that needs to be collected. which is wrong?

An online education platform deploys applications to the HUAWEI CLOUDSSER VICESTAGE PLATFORM FOR APPLICATION LIFECYCLE MANAGEMENT. In the process of use, it is found that there is a large delay, and the operation and maintenance engineer uses the distributed call chain analysis tool to analyze it, and the core of this method is to monitor through the following explicit resources Single selection

K8S occupies a dominant position in the container orchestration market, and more and more enterprises adopt K8S clusters as the operating environment of services, and cluster security has received more attention, such as image scanning of used container images, running business containers in privileged mode, and enabling role-based access control for K8S clusters (RBAC) and other behaviors are security risks.