You have been commissioned to collaborate with 8 employees from various branches of a national enterprise to develop a web application intended for the training of new sales staff. Given the complexities of this task, it's crucial to consider various elements like client-server requirements, memory, storage space, and networking speed for optimal application performance.

 1. Identify six collaboration tools that cater to these requirements, facilitating seamless teamwork. 

2. Out of the tools you've listed, which one do you believe would be the most beneficial for this project when considering client-server interactions, memory usage, storage capacity, and networking speed? Provide reasons to justify your choice. 

3. Given the nature of the web application for training new sales employees, how do you plan to integrate client-server interactions to ensure seamless content delivery, especially considering varying networking speeds at different branches?

4. Considering the anticipated growth in the number of sales employees being trained, what provisions would you recommend for scalable memory and storage solutions within the application's infrastructure to prevent any future bottlenecks or slowdowns?