The correct answers are A and E. Option A is correct because AWS Cloud enables users to pay only for the resources they consume, which means they can trade fixed capital expenses for variable operational expenses. This flexibility allows for better cost management and can lead to cost savings. Option E is correct because AWS operates at a massive scale, which allows it to spread the costs of infrastructure maintenance and updates across a large number of users. This results in lower per-user costs compared to what users would face if they were to manage their own infrastructure. Options B, C, and D, while beneficial, do not directly relate to cost-effectiveness. Option B refers to the speed of deployment, C to operational agility, and D to operational responsibility, none of which are directly tied to cost savings or cost management.