Answer: Configuration of security groups, Encryption of customer data on AWS

Under the AWS shared responsibility model: **Customer Responsibilities:** - **Configuration of security groups (B)** - Customers are responsible for configuring security groups, which act as virtual firewalls for EC2 instances - **Encryption of customer data on AWS (C)** - Customers are responsible for implementing data encryption for their data stored on AWS services **AWS Responsibilities:** - **Physical security of AWS facilities (A)** - AWS is responsible for the physical security of data centers - **Management of AWS Lambda infrastructure (D)** - AWS manages the underlying infrastructure for serverless services like Lambda - **Management of network throughput of each AWS Region (E)** - AWS manages the network infrastructure and throughput between regions The shared responsibility model divides security responsibilities where AWS is responsible for security **of** the cloud (infrastructure), while customers are responsible for security **in** the cloud (their data, applications, and configurations).

Author: Ritesh Yadav