Explanation:

Microsoft states that Security defaults are baseline protections in Azure Active Directory (now Microsoft Entra ID) that "make it easier to help protect your organization from identity-related attacks." One of the core behaviors is that security defaults "require all users to register for Azure AD Multi-Factor Authentication," and enforce "multi-factor authentication for all users," with special emphasis that "administrators are required to do multi-factor authentication." Security defaults also "block legacy authentication" and add protections for privileged operations, but the universal control that applies to every user is MFA. Importantly, enabling security defaults does not turn on paid capabilities such as Azure AD Identity Protection or Privileged Identity Management (PIM); those are separate, premium features. The baseline is intentionally simple and tenant- wide: require MFA registration, challenge with MFA when risk or sensitive operations are detected, and reduce exposure by disabling legacy protocols. Therefore, when you enable security defaults, multi-factor authentication (MFA) will be enabled for all Azure AD users, aligning with Microsoft's guidance that security defaults "help protect all organizations by requiring MFA and disabling legacy authentication."

Microsoft's SCI learning content describes the Microsoft 365 Defender portal as a unified security operations experience that surfaces security posture and active threats on a card-based dashboard. In the overview of the portal, Microsoft explains that the home page "presents key security information in dashboard cards," and that among these cards are summaries that highlight risky entities such as "Users at risk" and "Devices at risk." These cards provide quick, actionable visibility for analysts by aggregating detections and exposure data across Microsoft Defender services (for identities and endpoints). The guidance emphasizes that the portal
"correlates signals across identities, endpoints, email, and applications" and that security teams can use the dashboard cards to pivot directly into incidents and investigations from "Users at risk" or "Devices at risk" to take containment or remediation actions.
By contrast, Compliance Score is part of Microsoft Purview Compliance Manager, not the Microsoft 365 Defender portal; Service Health and User Management are functions of the Microsoft 365 admin center.
Therefore, the cards you'll find on the Microsoft 365 Defender portal that match the choices provided are Users at risk and Devices at risk.

To on-board Azure Sentinel, you first need to connect to your security sources. Azure Sentinel comes with a number of connectors for Microsoft solutions, including Microsoft 365 Defender solutions, and Microsoft 365 sources, including Office 365, Azure AD, Microsoft Defender for Identity, and Microsoft Cloud App Security, etc.
Reference:
https://docs.microsoft.com/en-us/azure/sentinel/overview

Explanation:

Explanation:
In Microsoft Sentinel, playbooks are the feature that integrates with Azure Logic Apps to automate response.
Microsoft's documentation describes them as "collections of procedures that can be run from Microsoft Sentinel in response to an alert" and clarifies that "playbooks are built on Azure Logic Apps" providing a workflow engine and a gallery of connectors to other Microsoft and third-party services. Playbooks can be triggered automatically from analytics rules or manually from incidents and alerts, enabling orchestration such as assigning owners, creating tickets, disabling accounts, blocking IPs, or posting to collaboration channels.
The platform emphasizes that the Logic Apps foundation gives security teams a visual designer, managed connectors, and run history to track execution and outcomes. In short, Sentinel uses playbooks to "automate and orchestrate responses to alerts and incidents", reducing mean-time-to-respond and standardizing actions across your SOC. Other Sentinel components serve different purposes: analytic rules detect threats, hunting queries aid proactive investigation, and workbooks provide dashboards and visualizations. Therefore, the correct completion is: Microsoft Sentinel playbooks use Azure Logic Apps to automate and orchestrate responses to alerts.