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$\mathrm{.}192\mathrm{.}169\mathrm{.}15\mathrm{.}78.$c$\mathrm{.}150\mathrm{.}1\mathrm{.}46\mathrm{.}78.$d$.$None.e$\mathrm{.}172\mathrm{.}32\mathrm{.}16\mathrm{.}75.$