When reserving a company name, there is a chance that it may get rejected if it is too similar to an company name or trademark that has already been reserved.

For this reason, when registering you will be allowed to enter 4 name options. If your first option is rejected, the second option will be used, then third etc.

By entering more then one option it means that it's much more likely for one of them to be accepted and removes the need to resubmit your application with a new set of names.