Exam MS-721 topic 1 question 1 discussion

Actual exam question from Microsoft's MS-721

Question #: 1
Topic #: 1

HOTSPOT -
You have a Microsoft Teams Phone deployment that contains a Session Border Controller (SBC) named SBC1.contoso.com.
Direct Routing integrates with a PBX phone system that uses only four-digit dialing and is configured to use the SBC.
Teams is configured to use dial plans that normalize any four-digit calls to E.164.
You have the following translation rule.

You need to ensure that calls to the legacy PBX pass only a four-digit extension.
How should you complete the PowerShell command? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.