Question: For IEEE 8 0 2 . 1 1 WLANs, what is a reason why DSSS ( direct sequence spread spectrum ) and OFDM ( orthogonal

For IEEE 802.11 WLANs, what is a reason why DSSS (direct sequence spread spectrum) and OFDM (orthogonal frequency division multiplexing) are used?
a. FDM is preferred, but DSSS and OFDM are cheaper and easier to implement
b. both DSSS and OFDM are resilient in RFI environments and are spectrally efficient
c. both DSSS and OFDM are considered spread spectrum technologies
d. DSSS and OFDM are methods used for either analog or digital signal transmission

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