You have an Azure AD tenant named Contoso.com and an AKS cluster named AKS1. AKS1 is not accessible using accounts from Contoso.com. To allow Contoso.com accounts to access AKS1 while minimizing administrative effort, what should you do first?

To enable Azure AD integration for an existing AKS cluster, you must recreate the cluster. AKS clusters are deployed with or without Azure AD integration, and this setting cannot be changed after creation. Recreating the cluster allows you to specify Azure AD integration during the deployment process, which is the most straightforward way to achieve the goal with minimal administrative effort compared to complex workarounds. Upgrading Kubernetes version (option B) does not enable Azure AD integration. Implementing Azure AD Premium P2 (option C) or configuring User settings (option D) are not directly related to enabling Azure AD integration for an AKS cluster itself, though Premium P2 offers features like Conditional Access that can be used with Azure AD integrated AKS.