What is the purpose of ACL type prefix set entries in RPL prefix sets?

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What is the purpose of ACL type prefix set entries in RPL prefix sets?
A . They hold IPv4 or IPv6 prefixes that do not match specifications.
B. They hold IPv4 or IPv6 prefix match specifications.
C. They hold IPv6 prefix match specifications.
D. They hold IPv4 prefixes that do not match specifications.

Answer: B