1). Of the 14 2.4 GHz channels used in Wi-Fi, the Federal Communications Commission (FCC) only allows ___ of these channels to be used in the united states. 2). Orthogonal Frequency Division Multiplexing (OFDM) as used in Wi-Fi takes a single 20 MHz wide channel and divides it into ___separate, closely and prcised subcarriers. Of these, 4 of them are not used to transmit data and are known as pilot carriers. Answer consists of a whole number with no label (just specify that number!).