Answer:
The correct answer to the following question will be Direct Sequence Spread Spectrum (DSSS).
Step-by-step explanation:
DSSS greatly improves the protection against interfering (or jamming) signals, in particular, the narrow band, making the signal less apparent. It also guarantees transmission confidentiality when the code is not publicly known.
DSSS can also be used as a multi-access method, which uses simultaneously numerous pseudo-random spreading codes. The Direct Sequence CDMA is this multi-access technique more popular.
The IEEE 802.11b and Zigbee DSSS are for example used.