Final answer:
Stackdriver Logging is used for collecting and analyzing log data to track user activity and debug issues, whereas Stackdriver Monitoring focuses on real-time system performance metrics and health (option b).
Step-by-step explanation:
The difference between Stackdriver Logging and Stackdriver Monitoring is that Stackdriver Logging is designed to collect, store, and analyze log data from G Cloud, Amazon Web Services (AWS), and various applications. This service allows users to track user activity, debug issues, and gain insight into the operational health of their services. Stackdriver Monitoring, on the other hand, focuses on the real-time performance metrics of a user's cloud services. It provides dashboards, alerts, and insights into how the system is performing, aiming to ensure that performance remains at optimal levels and to preemptively identify potential issues before they affect users.
Therefore, the correct answer is: b) Stackdriver Logging records errors and incidents, while Stackdriver Monitoring monitors real-time performance metrics.