Explanation
This configuration will achieve fault tolerance for managers in a swarm, because an odd number of manager nodes allows for quorum-based consensus among managers and avoids split-brain scenarios. According to the official documentation, having more than two manager nodes ensures that there is always at least one manager available in case of failures.
References: https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance

Explanation
This does not describe the role of Control Groups (cgroups) when used with a Docker container, because user authorization to the Docker API is not related to cgroups. According to the official documentation, cgroups are a Linux kernel feature that limits and isolates the resource usage of a group of processes, such as CPU, memory, disk I/O, network, etc. Docker can use cgroups to share available hardware resources to containers and optionally enforce limits and constraints.
References: https://docs.docker.com/config/containers/runmetrics/
https://bikramat.medium.com/namespace-vs-cgroup-60c832c6b8c8

Explanation
Disabling the Docker service via chkconfig or systemctl does not upgrade Docker Engine CE to Docker Engine EE. Disabling the Docker service only stops and prevents Docker from starting automatically on system boot. It does not change or upgrade the version of Docker Engine installed on the system. To upgrade Docker Engine CE to Docker Engine EE, you need to uninstall Docker Engine CE and install Docker Engine EE following the official instructions for your operating system. References:
https://docs.docker.com/engine/install/linux-postinstall/#disable-docker-from-starting-automatically-on-boot,
https://docs.docker.com/engine/install/centos/#uninstall-old-versions,
https://docs.docker.com/engine/install/ubuntu/#uninstall-old-versions,
https://docs.docker.com/engine/install/debian/#uninstall-old-versions,
https://docs.docker.com/ee/docker-ee/linux-install/

Explanation
net is not a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. According to the official documentation, net is one of the namespaces that are enabled by default when using namespaces for isolation.
References: https://docs.docker.com/engine/security/userns-remap/#user-namespace-known-limitations

Explanation
This set of Kubernetes tools and steps does not accomplish this, because there is no such key as
.spec.containers.configMounts in the pod specification. According to the official documentation, the correct key to use for mounting a configuration file directly into a container is .spec.containers.volumeMounts, which requires a corresponding volume definition in .spec.volumes.
References:
https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#add-configmap-data-to-a-vo
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.22/#container-v1-core