Which statements regarding the $802\mathrm{.}11$ wireless standards are FALSE $($Select all the correct options$)?$

a$.$

$802\mathrm{.}11$a is the most preferred $802\mathrm{.}11$ standard.

b$.$

$802\mathrm{.}11$b separates the $3\mathrm{.}4-$GHz band into $26$ MHz channels.

c$.$

$802\mathrm{.}11$n boasts a maximum throughput of $600$ Mbps$,$ making it a realistic platform for telephone and video signals.