How do you ensure security in a multi-tenant AWS environment?

Security measures: 1) Use separate AWS accounts per tenant, 2) Implement IAM roles with least privilege, 3) Use VPC isolation and security groups, 4) Encrypt data at rest and in transit, 5) Implement audit logging with CloudTrail, 6) Use AWS Config for compliance monitoring, 7) Regular security assessments with Inspector and GuardDuty.