a$)$Which address class does the $192\mathrm{.}168\mathrm{.}10\mathrm{.}0$ network belong to$?$ b$)$What subnet mask should be used to subnet the $192\mathrm{.}168\mathrm{.}10\mathrm{.}0$ network to support the number of subnets and ip addresses per subnet shown in the following topology? Answer in decimal notation.

C$)$ in order to create the subnets as per the topology, x bits needs to be borrowed, which allows for the creation of y subnets and z hosts$/$ip addresses per subnet. Find values for x$,$y and z