"There's no need to specify storage accounts to store the backup data. The Recovery Services vault and the Azure Backup service handle that automatically." (Source: https://docs.microsoft.com/en-us/azure/backup/backup-create-rs-vault)

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Explanation:
After you've configured an Azure resource with a managed identity, you can give the managed identity access to another resource, just like any security principal.
Use Azure RBAC to assign a managed identity access to another resource
After you've enabled managed identity on an Azure resource, such as an Azure VM or Azure virtual machine scale set:
1. Sign in to the Azure portal using an account associated with the Azure subscription under which you have configured the managed identity.
2. Navigate to the desired resource on which you want to modify access control. In this example, we are giving an Azure virtual machine access to a storage account, so we navigate to the storage account.
3. Select the Access control (IAM) page of the resource, and select + Add role assignment. Then specify the Role, Assign access to, and specify the corresponding Subscription. Under the search criteria area, you should see the resource. Select the resource, and select Save.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/howto-assign- access-portal

Explanation
Can we deploy Azure Load Balancer behind Front Door?
Azure Front Door needs a public VIP or a publicly available DNS name to route the traffic to. Deploying an Azure Load Balancer behind Front Door is a common use case.
Reference:
https://docs.microsoft.com/en-us/azure/frontdoor/front-door-faq

Explanation
Create budgets to manage costs and create alerts that automatically notify you are your stakeholders of spending anomalies and overspending.
To set it up, go to the Azure Portal, select 'Cost Management + Billing' -> 'Cost Management' -> 'Go to Cost Management'.

Note: Cost alerts are automatically generated based when Azure resources are consumed. Alerts show all active cost management and billing alerts together in one place. When your consumption reaches a given threshold, alerts are generated by Cost Management. There are three types of cost alerts: budget alerts, credit alerts, and department spending quota alerts.
Reference:
https://docs.microsoft.com/en-us/azure/cost-management-billing/manage/getting-started