Question: In the context of GPRS attach procedures with IMSI already attached, what is the relationship between the four defined measurements according to the '3 out of 4 approach'?
Option 1: Number of Attempted = Number of Successful - Total Number of Failed + Aborted
Option 2: Number of Attempted = Number of Successful + Total Number of Failed - Aborted
Option 3: Number of Attempted = Number of Successful + Total Number of Failed + Aborted
Option 4: Number of Attempted - Number of Successful = Total Number of Failed / Aborted
Explanation: The correct relationship, as defined by the '3 out of 4 approach' for GPRS attach procedures with IMSI already attached, is that the total number of attempted procedures is the sum of successful, failed, and aborted procedures. This ensures a comprehensive accounting of all outcomes in the attachment process, reflecting the principle of inclusivity in performance measurement.