An organization is moving its infrastructure to the cloud in an effort to meet the budget and reduce staffing requirements. The organization has three environments: development, testing, and production. These environment have interdependencies but must remain relatively segmented. Which of the following methods would BEST secure the company's infrastructure and be the simplest to manage and maintain?

A. Create three separate cloud accounts for each environment. Configure account peering and security rules to allow access to and from each environment.
B. Create one cloud account with one VPC for all environments. Purchase a virtual firewall and create granular security rules.
C. Create one cloud account and three separate VPCs for each environment. Create security rules to allow access to the from each environment.
D. Create three separate cloud accounts for each environment and a single core account for network services. Route all traffic through the core account.

Answer: C. Create one cloud account and three separate VPCs for each environment. Create security rules to allow access to the from each environment.