Which two challenges do802.1ig barcode scanners present to a WLAN design? (Select two.)

Which two challenges do802.1ig barcode scanners present to a WLAN design? (Select two.)
A . roaming between APs
B . encountering RF interference by devices
C . determining the RF channel bandwidth consumed per Barcode scanner
D . implementing adequate security measures to ensure PCI compliance
E . providing consistent performance on all available channels

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Answer: DE