Final answer:
Month end billing is started is an example of a temporal event.
Step-by-step explanation:
An example of a temporal event from the given options is 1) Month end billing is started. Temporal events are those that occur at a specific time or within a specific period. In this case, the event of starting month end billing happens at a specific time each month, marking the end of the billing cycle. Other options may not necessarily be temporal events, as user logins, customer address updates, and inventory reorders can happen at any time and are not tied to specific periods.