Correct Answer: D.
Continuous business value is achieved with the ability to monitor existing running systems & improving processes and procedures by managing & automating changes.
For eg in response to a saturation in CPU usage of an EC2 instance, a monitoring system like CloudWatch will automatically trigger a creation of a new instance though alarms.
This will ensure that the system's capacity meets changing load demands.
This is a part of the Operational Excellence pillar of the AWS well architected framework which focuses on running & monitoring systems to deliver business value.
Option A is incorrect since the Reliability pillar focuses on the ability of the system to recover from infrastructure or service failures.
Option B is incorrect since scalability is a by-product of monitoring solutions which provide the capability for infrastructure resources to cope with increase or decrease of capacity by adding or terminating resources when not needed.
Option C is incorrect since automation is the ability to induce certain systemic requirements like scalability, auto recovery using monitoring solutions.
It helps in improving system's stability & efficiency of an Organization.
Option D is CORRECT.
