An organization is managing a Redshift Cluster in AWS. They need to monitor this Redshift cluster`s performance to ensure that it is performing as efficiently as possible. Which of the following services should be used for achieving this requirement? (Select Two)

Answer options:

A.CloudFormation
B.SQS
C.CloudWatch
D.AWS Trusted Advisor

Correct Answers - C and D
AWS Documentation mentions the following on monitoring Redshift Clusters.
Amazon CloudWatch metrics help you monitor the physical aspects of your cluster, such as CPU utilization, latency, and throughput. Metric data is displayed directly in the Amazon Redshift console. You can also view it in the Amazon CloudWatch console, or you can consume it in any other way you work with metrics such as with the Amazon CloudWatch Command Line Interface (CLI) or one of the AWS Software Development Kits (SDKs).
For more information on monitoring Redshift, please visit the URL below.
https://docs.aws.amazon.com/redshift/latest/mgmt/metrics.html
For Option D, please go through the link below. 
https://aws.amazon.com/about-aws/whats-new/2016/03/aws-trusted-advisor-adds-checks-for-amazon-s3-amazon-redshift-reserved-instances-security-and-service-limits/