A Lambda function needs network access to private resources inside a VPC. Which approach provides that access with the least operational overhead?

Configuring the Lambda function to run within the VPC using private subnets and attaching a security group is the most straightforward and operationally least burdensome method. This places the Lambda function directly into your VPC network, allowing it to access private resources using their private IP addresses, secured by security groups and network ACLs. Routing traffic through a VPN connection adds significant operational overhead for managing the VPN itself. Creating a VPC endpoint for the Lambda function is not applicable; VPC endpoints are for services accessed from a VPC, not for Lambda accessing resources within a VPC. AWS PrivateLink is used to access services hosted by other AWS accounts or third parties privately, not typically for a Lambda function accessing resources within its own VPC.