You work for a Marketing Company that is currently using a mix of $802\mathrm{.}11$b and $802\mathrm{.}11$g clients. Rumor has it that your company is about to merge with another company that uses a different wireless technology. Which of the following would be compatible with what your WLAN currently runs?

c$.$ Bluetooth

d$.$ WiMAX

b$.802\mathrm{.}11$n

a$.802\mathrm{.}11$a