Consider distributing a file of F $=10$ Gbits to N $=20$ peers. The server has an upload rate of us $=1-$Gbps$,$ and each peer has a download rate of dc $=50-$Mbps and an upload rate of u $=5-$Mbps$.$ Find out the minimum distribution time for $($a$)$ client$-$server distribution and $($b$)$ P$2$P distribution.