Answer: Ensuring security within the code, Developing and maintaining code

In AWS Lambda, a company is responsible for the security of the code it deploys and for writing and updating that code. AWS handles the underlying infrastructure, including server and operating system maintenance, capacity provisioning, automatic scaling, and security patch deployment for the infrastructure itself. Therefore, the correct answers are A (Ensuring security within the code) and D (Developing and maintaining code). Options B (Determining CPU resource allocation) and C (Applying operating system patches) are not the company's responsibilities as AWS abstracts those details away in a serverless environment. Option E (Securing the infrastructure foundation) is also not the company's responsibility, as AWS manages the security of the infrastructure.

Author: LeetQuiz Editorial Team