$($a$)$ How many subnets are in this network?

$($b$)$ How many addresses $($including $223\mathrm{.}1\mathrm{.}2\mathrm{.}1,223\mathrm{.}1\mathrm{.}2\mathrm{.}2$ and $223\mathrm{.}1\mathrm{.}2\mathrm{.}6)$ the network operator can assign in

the PC$0$ subnet?

$($c$)$ Can P C$0$ directly communicate with P C$1$ and P C$2?$ If not, which is the first interface the packet will

be forwarded to$?$

$($d$)$ Assuming P C$0$ knows P C$2$ netmask, if P C$0$ wants to send a broadcast IP packet that can reach P C$2,$

what are the source address and destination address?