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Which numbers can reach 77555 in this situation?

A network administrator finds directory number 77555 in the partition. Which numbers can reach 77555 in this situation?
A. Only numbers in the partition can reach 77555.
B. All numbers in every calling search space can reach 77555.
C. Only internal directory numbers can reach 77555.
D. Directory number 77555 cannot be reached by any number.
Correct Answer: A