In a public sector organization, a project manager is tasked with improving communication channels among various departments to enhance collaboration and efficiency. The manager decides to implement a multi-channel communication strategy that includes email, instant messaging, video conferencing, and a centralized project management tool. Each channel has its own strengths and weaknesses. Considering the principles of effective communication, which channel would be most effective for real-time collaboration and quick decision-making among team members who are geographically dispersed?