C. Maintain the configuration of guest operating systems and applications: Customers are responsible for configuring and securing the operating systems and applications running on their instances or virtual machines.
D. Manage decisions involving encryption options: Customers are responsible for making decisions regarding encryption options for their data, including determining which data to encrypt and selecting appropriate encryption mechanisms.
Explanation:
C. Customers are responsible for maintaining the configuration, security, and updates of the guest operating systems and any applications running on their Amazon EC2 instances or other AWS resources. This includes tasks such as applying security patches and updates to the operating systems and applications.
D. Customers are responsible for managing decisions related to encryption options for their data. This includes deciding whether to encrypt data at rest, in transit, and managing encryption keys and policies for their AWS resources.
Under the AWS shared responsibility model, AWS manages the infrastructure, while the customer is responsible for the management of the guest operating systems (including updates and security patches), application software, and for the configuration of AWS provided security group firewalls. The customer also has to manage encryption options and key management, except for the infrastructure where AWS manages these (e.g., managed services).
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