Which statement is true about the longer router-filter match type?

Which statement is true about the longer router-filter match type?
A . All router within the specified prefix that are longer than or equal to the given prefix are considered a match.
B . All router within the specified prefix that are longer or equal to the given prefix up to a defined acceptable prefix length are considered a match.
C . All router within the specified prefix that are longer than the given prefix up to a defined acceptable prefix length are considered a match.
D . All router within the specified prefix that are longer than given prefix are considered a match.

Answer: A