Exam AWS Certified Solutions Architect - Professional topic 1 question 885 discussion

A new application is running on Amazon Elastic Container Service (Amazon ECS) with AWS Fargate. The application uses an Amazon Aurora MySQL database.
The application and the database run in the same subnets of a VPC with distinct security groups that are configured.
The password for the database is stored in AWS Secrets Manager and is passed to the application through the DB_PASSWORD environment variable. The hostname of the database is passed to the application through the DB_HOST environment variable. The application is failing to access the database.
Which combination of actions should a solutions architect take to resolve this error? (Choose two.)