A retail company is transitioning its on-premises application to the AWS Cloud. The company operates two on-premises data centers: one on the east coast of the United States and one on the west coast. Each data center contains four database systems, with the largest database storing 500 GB of data. The data centers are connected via two 10 GbE circuits for data synchronization and each has two separate 1 GbE internet connections. The company intends to establish eight VPCs across the us-east-1 and us-west-2 Regions, with four VPCs in each region.

A network engineer must design a connectivity solution that ensures VPC-to-VPC communication and provides secure connections between the on-premises data centers and AWS during the migration. The solution must accommodate traffic spikes during database synchronization, enable the migration to be completed within a single weekend, and minimize long-term operational and human resource costs.

Which two steps should be combined to meet these requirements?