Question: Which of the following is NOT one of the primary categories of Measurement User Communities for Performance Management in a wireless telecommunications network?
Option 1: Network Operator's Business Community
Option 2: Network Operator's Maintenance Community
Option 3: External Regulatory Agency Community
Option 4: Equipment Vendor's Development Engineering Community
Explanation: The correct answer is Option 3 because the defined Measurement User Communities specifically include various groups directly related to Network Operators and Equipment Vendors. There is no mention of an 'External Regulatory Agency Community' among the listed categories, which are focused on Network Operator's communities and Equipment Vendor's communities.