A vendor is selected through a request for proposal (RFP) process for a global banking system that needs to be implemented in multiple countries for the organization. What is a best practice for the implementation phase?

1. Implement in all countries in parallel and get each sub-step done before starting the next
2. Implement in one country first and fix the problems there before proceeding
3. Ensure this phase of the RFP process takes less time than the prior phases
4. Implement in one country first and send out RFPs for the other countries while this is being done to encourage competitive pricing