In the scenario described, Dickson is performing an active assessment. This type of vulnerability assessment involves using automated tools to actively scan and probe the network for identifying hosts, services, and vulnerabilities. Unlike passive assessments, which rely on monitoring network traffic without direct interaction with the targets, active assessments engage directly with the network infrastructure to discover vulnerabilities, misconfigurations, and other security issues by sending data to systems and analyzing the responses. This approach provides a more immediate and detailed view of the security posture but can also generate detectable traffic that might be noticed by defensive systems or affect the performance of live systems.

This scenario reflects a compromised web application, likely due to injection attacks or file upload exploitation. The ECIH Web Application Incident Handling module emphasizes that containment must prevent further attacker access and stop malicious execution.
Option A is correct because identifying injection points and isolating affected components halts further exploitation and allows forensic investigation. ECIH warns against restoring or re-enabling applications without understanding the attack vector, as this often leads to reinfection.
Options B and C do not address security. Option D risks reintroducing malware if vulnerabilities remain.
Thus, targeted isolation and vulnerability identification is the correct containment action.