Final answer:
A Cloud Access Security Broker (CASB) is the best solution to optimize incident response times after migrating security solutions to the cloud, as it provides centralized monitoring and policy enforcement.
Step-by-step explanation:
To optimize the incident response time after migrating multiple on premises security solutions to the cloud, where analysts are spending a long time tracing information on different cloud consoles and correlating data in different formats, a Cloud Access Security Broker (CASB) can be beneficial. A CASB helps by providing a centralized platform for policy enforcement and consolidating the monitoring of multiple cloud services into a single pane of glass, making it easier for analysts to trace and correlate information quickly. Furthermore, a CASB often includes an advanced analytics engine which can aid in identifying and managing incidents across various cloud applications. So of the options given, a CASB is the best solution to optimize incident response times.