Final answer:
The AWS tool that can be used to store and analyze log files from an EC2 instance is Amazon CloudWatch.
Step-by-step explanation:
To store and analyze log files from an EC2 instance, the Amazon Web Services (AWS) tool that can be used is Amazon CloudWatch. Amazon CloudWatch is a monitoring and management service that collects and stores log files, metrics, and events from various AWS resources, including EC2 instances.
To use Amazon CloudWatch, Vera can configure the service to collect the system logs from the EC2 instance. She can then view and analyze the logs in the CloudWatch console or use CloudWatch APIs for more advanced log analysis.