Final answer:
In the field of WLAN standards, Direct-Sequence Spread Spectrum (DSSS) is supported by 802.11b and 802.11g. These two are among the earliest WLAN standards with 802.11b providing up to 11 Mbps and 802.11g offering up to 54 Mbps bandwidth.
Step-by-step explanation:
The two WLAN standards that support Direct-Sequence Spread Spectrum (DSSS) are 802.11b and 802.11g. Standard 802.11b was one of the first WLAN standards to be widely adopted and supports bandwidths up to 11 Mbps. Standard 802.11g was a later development that also supported DSSS and offered increased bandwidth up to 54 Mbps. It is compatible with 802.11b and continued to enable the use of DSSS for backward compatibility. In contrast, standards 802.11a and 802.11n do not support DSSS; instead, they utilize Orthogonal Frequency-Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) techniques respectively.