What happens if you do not specify dependencies from base packages while developing a custom package?

Does anyone knows the answer to this question:

What happens if you do not specify dependencies from base packages while developing a custom package?

I'm doing some certification tests, I have see this cuestion in several test but I can't find the correct answer. Here are the options:

-Development of any new functionality will be impossible

-It restricts the use of replacing parent schemas, e.g., Contacts and Accounts.

-The new functionality will only be operational under the user with administrator permissions in bpm’online

-Using the section wizard, you will not be able to save configuration schemas of the new section in such package

 

Thanks.