Question: What determines whether a handover or redirection to EPS is performed by the source NG-RAN node?
Option 1: Only radio criteria
Option 2: Only availability of the N26 interface
Option 3: Both radio criteria and availability of the N26 interface
Option 4: Neither radio criteria nor availability of the N26 interface
Explanation: The source NG-RAN node decides between handover or redirection to EPS based on both radio criteria and the availability of the N26 interface, as stated in the text. This decision is crucial for ensuring a seamless handover process between different radio access technologies (RATs).