The correct answer is Control which pods may be scheduled onto specific nodes.

Taints are applied to nodes to mark them as unsuitable for most pods and tolerations are placed on pods to allow them to be scheduled onto tainted nodes. This combination lets cluster operators isolate or reserve nodes for special workloads and ensures that only pods that explicitly tolerate a node will be scheduled there.

The taint and toleration mechanism is evaluated by the scheduler during placement and it is focused on node level placement rules rather than on scaling, resource quota enforcement, or image storage.

Horizontal Pod Autoscaler is incorrect because that feature adjusts the number of pod replicas based on metrics and it does not control which nodes pods run on.

Node resource quota management is incorrect because quotas limit aggregate resource consumption and enforce limits across namespaces or nodes and they do not selectively prevent pods from being scheduled onto specific nodes in the same way taints do.

Container Registry is incorrect because a registry is used to store and retrieve container images and it has no role in scheduling decisions.

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