Final answer:
Azure Advanced Threat Protection (ATP) is the correct Azure security solution to identify and investigate suspicious user activities. It leverages Active Directory signals to detect threats and is capable of analyzing user behavior to provide timely alerts.
Step-by-step explanation:
If you need an Azure security solution that is able to identify and investigate suspicious user activities, you should use D. Azure Advanced Threat Protection (ATP). Azure ATP is a cloud-based security solution that helps protect your enterprise hybrid environments from multiple types of advanced targeted cyber attacks and insider threats. It leverages your on-premises Active Directory signals to identify, detect, and investigate advanced threats, compromised identities, and malicious insider actions directed at your organization.
Azure ATP is capable of analyzing user activities and behavior, providing vital information that can help in identifying anomalies that may indicate a security issue. By combining this feature with its ability to understand normal network behavior and user conduct, ATP can give accurate and timely alerts that enable organizations to swiftly respond to potential threats.