Which IP address is a private IP address $($select all that applies$)?$Select one or more:a$\mathrm{.}100\mathrm{.}234\mathrm{.}56\mathrm{.}7.$b$\mathrm{.}192\mathrm{.}168\mathrm{.}4\mathrm{.}67.$c$\mathrm{.}98\mathrm{.}76\mathrm{.}142\mathrm{.}3.$d$\mathrm{.}172\mathrm{.}29\mathrm{.}89\mathrm{.}44.$e$.$None.