$(10$ points$)$ Consider an x$-$bit message. It is required to send this message to the

destination across k hops. Two techniques are compared: Circuit switching and packet

switching. The circuit setup time is $\text{'}$s$\text{'},$ propagation delay is $\text{'}$d$\text{'}$ sec per hop. the packet

size is $\text{'}$p$\text{'}$ bits, and the data rate is $\text{'}$b$\text{'}$ bps$.$ Under what condition does the packet

network have a lower delay as compared to circuit switched network?