Match the following SDLC implementation methods with their descriptions. Balances risk/cost, can see who whole systems interacts and can use small numbers from each area to train others, but may miss problems when large volumes of employees start using the system.. The most cost effective method, but also the riskiest. Best suited for smaller or noncritical projects. Balances risk/cost \\& can learn from mistakes of earlier module implementations, but may miss problems when system as a whole is deployed. The safest, but most expensive implementation methods. Work is duplicated while both systems are run at once until the new system is thoroughly tested