Using cisco best practices, which implementation allows call transfers to internal directory numbers but not to PSTN numbers?

Refer to the exhibit.

Cisco UCM is integrated with Cisco Unity connection via a SIP truck and is configured using a globalized dial plan (directory number are configured with “*”).

Using cisco best practices, which implementation allows call transfers to internal directory numbers but not to PSTN numbers?
A . remove PSTN-PT from voicemail_CSS
B . change the order of partitions to put GLOBAL-INERNAL-PT first in Voicemail_CSS
C . create a BLOCK-PSTN-PT partition and add it to Voicemail_CSS
D . block pattern +* in the Cisco Unity restriction table

View Answer

Answer: D