Question: What type of information can be exposed by the PSA UPF to support congestion information exposure and ECN marking for L4S, based on the PCC rule from PCF?
Option 1: UL and/or DL congestion information monitoring
Option 2: UL and/or DL Data rate information
Option 3: Round trip delay for two service data flows
Option 4: AF request information
Explanation: According to the text, the PSA UPF can expose the UL and/or DL congestion information monitoring (see clause 5.45.3) based on the PCC rule from PCF, which is common to support congestion information exposure and to support ECN marking for L4S in PSA UPF as described in clause 5.37.3.3.