Question: What is the purpose of the IE CellReselectionSubPriority in RRC protocol?
Option 1: To determine the absolute priority of a carrier frequency for E-UTRA and NR by adding a fractional value to cellReselectionPriority.
Option 2: To indicate the preferred cell reselection algorithm for E-UTRA and NR.
Option 3: To specify the maximum allowed delay for cell reselection in E-UTRA and NR.
Option 4: To define the minimum required signal strength for cell reselection in E-UTRA and NR.
Explanation: The IE CellReselectionSubPriority is used to add a fractional value to the cellReselectionPriority to obtain the absolute priority of a carrier frequency for E-UTRA and NR. This allows for more precise control over cell reselection decisions in multi-carrier scenarios.