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The choice that correctly describes a cloud computing service that includes penetration testing and intrusion detection is Security as a Service (SECaaS). This model provides comprehensive security services over the internet, allowing organizations to leverage the expertise of third-party security providers rather than managing complex security solutions in-house.

Penetration testing involves simulating cyber attacks to identify vulnerabilities in a system, while intrusion detection focuses on identifying and responding to actual security breaches. Both services are critical for maintaining the security posture of an organization and are typically offered under the SECaaS model, where security measures are delivered as a subscription service in the cloud.

Other service models like Infrastructure as a Service (IAAS), Platform as a Service (PAAS), and Identity as a Service (IDaaS) focus primarily on delivering computing infrastructure, application platforms, and identity management services, respectively. While these models may incorporate certain security features, they do not specifically provide the targeted security functionalities that SECaaS offers, which include tools like penetration testing and intrusion detection as core components of their service repertoire.