Which mechanism in IPv6 allows for SLAAC to avoid duplicating an IPv6 address?

A. NDP (NS/NA)
B. DAD (NS/NA)
C. SLAAC (RS/RA)
D. ARPv6(NS/NA)

B. Duplicate Address Detection, or DAD, uses Neighbor Solicitation and Neighbor Advertisement messages to avoid duplicate addresses when SLAAC is being used.