Question: In a cell, what does the 'Mean number of RACH preambles received' measurement categorize RACH preambles into, in addition to dedicated preambles?
Option 1: By UE (User Equipment) type and by transmission power level
Option 2: Solely by transmission power level, without any further subdivision
Option 3: Into two groups based on their range: Group A ('low range') and Group B ('high range')
Option 4: By the type of service (e.g., voice, data) they are associated with
Explanation: This measurement separates randomly chosen preambles into two range-based groups: Group A ('low range') and Group B ('high range'), aside from dedicated preambles. This distinction is crucial for network performance analysis, understanding the load and access patterns within a cell.