You are attempting to map a drive letter to a Microsoft Azure File Storage cloud share, but the attempt fails with errors. What is most likely the issue, given the problems presented?

A. Microsoft Azure File Storage requires the installation of a special client in order to support mapped drives.
B. Microsoft Azure File Storage does not support the use of mapped drive letter shares over the Internet.
C. Your ISP or router is blocking the use of port 445 outside your local network.
D. Your ISP or router is blocking the use of port 139 outside your local network.

Answer: C