Explanation
Kubernetes objects are persisted in the etcd key-value store, which is a distributed and consistent data store that serves as the backbone of the Kubernetes cluster. The etcd store holds the configuration data, state, and metadata of the cluster, and is accessed by the Kubernetes API server. The etcd store ensures that the cluster state is consistent and reliable across multiple nodes and failures. The other options are not relevant for Kubernetes object persistence, as they are either different types of data stores (column store, row store) or misspelled (key value store). References: Side-by-Side Extensibility Based on SAP BTP, Kyma Runtime - Unit 2 - Lesson 1: Kubernetes and Kyma Core Concepts, Kubernetes Documentation - Kubernetes Components - etcd