SQL Server Patching question

If I have an instance at SQL Server 2016 SP1-CU7-GDR (KB4057119) and want to jump over to the latest SP2 path, which patch or patches do I have to run?

1. SP2 = KB4052908
2. SP2-CU2 = KB4340355
3. SP2-CU2-GDR = KB4458621

Do I run all 3 of these in order, do I run just #1 and #3, or can I just run #3 all by itself? It’s a bit confusing, but would appreciate the help.

Thanks,

Robert