To modify a playbook in Azure Sentinel so it sends emails to the resource owner, what should you do?

To ensure that a playbook in Azure Sentinel sends emails to the resource owner, it is essential to configure it properly in response to alerts. Adding an alert and modifying the action is the correct approach because alerts are the primary way to trigger playbooks based on specific conditions that arise from security incidents or potential threats.

When an alert is generated due to certain criteria being met, you can define specific actions to take in response to that alert. In this case, modifying the action allows you to specify that an email should be sent to the resource owner whenever that alert occurs. This is a critical step in ensuring that relevant stakeholders are informed and can take necessary actions promptly.

In contrast, the other options involve different mechanisms that do not directly address the requirement to send an email to a resource owner in response to an alert. While conditions and connectors are important for playbooks, the primary method to initiate the desired action of email notification is by properly setting up and modifying the appropriate alert and its associated actions.