A client who has adopted AWS Cloud would like to ensure that his systems need to deliver continuous business value & improve supporting processes and procedures. Which design pillar will he need to focus for achieving this?

Answer options:

A.Reliability
B.Scalability
C.Automation
D.Operational Excellence

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. Refer to the above description for details
Diagram:
Reference:
https://aws.amazon.com/blogs/apn/the-5-pillars-of-the-aws-well-architected-framework/