A$)$ large number of consecutive IP address are available starting at $192\mathrm{.}16\mathrm{.}0\mathrm{.}0.$ Suppose that three organizations, A$,$ B and C$,$ request a$000($a thousand$),$ b$000($b thousand$)$ and c$000($c thousand$)$ addresses, respectively, and in that order. For each of these, give the first IP address assigned, the last IP address assigned, and the mask in the w$.$x$.$y$.$z$/$s notation. The student should write details of calculations. $($Note: a$,$ b and c are defined as nonzero three numbers of student ID beginning from right. For example, if your student ID is $189203609$ then a$=6,$ b$=0$ and c$=9.$ So$,$ organization A requests $6000,$ B requests $0$ and C requests $9000$ addresses$).$