Select all that correctly describe the various Wireless Local Area Network $($WLAN$)$ protocols that are based on the IEEE $802\mathrm{.}11$ standards, commonly known as Wi$$Fi$.$

Group of answer choices

The $802\mathrm{.}11$n protocol provides three channels of $450$ Mbps each that are designated as channels $1,2$ and $3.$

There are four versions of the $802\mathrm{.}11$ac protocol.

The development of new devices that adhere to the $802\mathrm{.}11$a protocol is discontinued.

All Wi$$Fi WLAN protocols are backward compatible.

The $802\mathrm{.}11$n WLAN protocol has a greater maximum range than does the $802\mathrm{.}11$g WLAN protocol.