How many classes do IPv$4$ Addresses have?a$)5$b$)4$c$)3$d$)22.$ IPv$6$ Address consists of how many bits in total and how many bits in each field?a$)128$ and $16$b$)128$ and $64$c$)64$ and $16$d$)64$ and $323.$ What is the significance of Subnet mask? $($Select one$)$a$)$ Specifies network portion and host portionb$)$ Not necessary for IP assignmentc$)$ Hides the subnet IDd$)$ Hides the host ID $4.$ Which class in IPV$4$ address is used for multicasting purpose?a$)$ Class Ab$)$ Class Bc$)$ Class Dd$)$ Class E $5.$ Please choose the range of Loopback IP addressa$)127\mathrm{.}0\mathrm{.}0\mathrm{.}0127\mathrm{.}255\mathrm{.}255\mathrm{.}255$b$)192\mathrm{.}168\mathrm{.}0\mathrm{.}0192\mathrm{.}168\mathrm{.}255\mathrm{.}255$c$)10\mathrm{.}0\mathrm{.}0\mathrm{.}010\mathrm{.}255\mathrm{.}255\mathrm{.}255$d$)172\mathrm{.}16\mathrm{.}0\mathrm{.}0-172\mathrm{.}31\mathrm{.}255\mathrm{.}255$