The correct answers are B and E. Option B, 'Create tasks using the awsvpc network mode,' is correct because the awsvpc network mode provides each task with its own elastic network interface, allowing for better network isolation and security, which aligns with the security policy requirements. Option E, 'Apply security groups to the tasks and employ IAM roles for tasks to access other AWS resources,' is correct because applying security groups to tasks ensures network traffic is controlled at a granular level, and using IAM roles for tasks allows specific permissions to be allocated directly to tasks, adhering to the principle of least privilege. Option C is incorrect because although applying security groups to EC2 instances and using IAM roles for instances provides security control, it does not offer the fine-grained control achievable by attaching roles to tasks directly. Option D is also incorrect because passing IAM credentials into the container is not recommended as it can expose sensitive information and does not adhere to the best practices for security in AWS.