The correct option is nodeSelector.

nodeSelector is a simple map of key value pairs in the Pod spec that tells the scheduler to place the Pod only on nodes that have matching labels. To target a specific availability zone you set the zone label such as topology.kubernetes.io/zone as a key in the selector so the Pod will run only on nodes in that zone.

affinity is incorrect because affinity is a broader field that includes nodeAffinity and offers richer matching rules and preferences, but the question asks which Pod spec field to configure to directly target nodes in a specific zone and the simplest direct field is nodeSelector.

annotations are incorrect because annotations are metadata for storing non functional information and they do not influence the scheduler when choosing nodes.

tolerations are incorrect because tolerations allow Pods to tolerate node taints and they do not by themselves select nodes by label or zone. Tolerations work with taints but do not target availability zones.

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