A Deployment is a Kubernetes object that allows you to perform a rolling update without disrupting services. A Deployment manages a ReplicaSet or a Pod and provides declarative updates for them. You can describe the desired state of your application using a Deployment, and it will change the actual state to the desired state at acontrolled rate. A Deployment also allows you to roll back to a previous version if something goes wrong during the update14.
The other options are incorrect because:
A ReplicaSet is a Kubernetes object that ensures that a specified number of pod replicas are running at any given time. It does not provide any mechanism for updating or rolling back pods15.
A Service is a Kubernetes object that defines a logical set of pods and a policy to access them. It does not provide any mechanism for updating or rolling back pods16.
A Container is not a Kubernetes object, but rather a component of a Pod. A Pod is the smallest deployable unit of computing in Kubernetes. A Pod can contain one or more containers that share storage and network resources. A Pod does not provide any mechanism for updating or rolling back itself or its containers17.
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