Which numbers can reach 77555 in this situation?

A network administrator finds directory number 77555 in the <none> partition.
Which numbers can reach 77555 in this situation?
A. Only numbers in the <none> partition can reach 77555
B. All numbers in even/ calling search space can reach 77555,
C. Only internal directory numbers can reach 77555.
D. Directory number 77555 cannot be reached by any number

Answer:

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