Section B $$ Video Streaming Service Project

A company has initiated a project to establish a video streaming service.

They need to cater to thousands of simultaneous users while ensuring smooth and synchronized streaming.

$($a$)$ Which Transport layer protocol would be best suited for this streaming service, and why?

$($b$)$ If users start experiencing delays and glitches during streaming, at which two layers of the TCP$/$IP model would you begin your troubleshooting, and what would you be looking for?

$($c$)$ Considering security, if the company wanted to implement a system where they could inspect and filter specific types of content, at which layer would this mechanism be primarily implemented?