B. I want to log an error so that when I rollback my business transaction, I do not lose my error log entry.

C. Each user of my application needs to work autonomously with the tables of the application. In other words, if USER1 makes a change to table ABC, then I want to make sure that USER2 can also work on that table at the same time (but not necessarily the same rows).

D. I need to keep an audit trail of every row that is retrieved by a set of queries in my application.