What is the notation used to denote that you have released your discretion on a strip?

The notation that denotes the release of discretion on a strip is represented by using the terms "SYD/call sign." When you indicate that you've released your discretion, you are informing other controllers that they can handle the aircraft as they see fit, based on the standard operating procedures and traffic conditions. This is a key aspect of air traffic control communication to ensure that all relevant parties are aware of the status of the aircraft and any handling allowed by the controller.

The other options do not convey the same message. RP 25NE HEZ/(time reported) references a specific reporting point and time but does not reflect discretionary authority. The notation "100B150" typically indicates altitude restrictions rather than discretion release. Lastly, "APCH, VR, ILS, NDB" are terms related to different approach types and navigation aids, and they do not relate to the communication of discretion release.