Final answer:
Leads is not a standard object in the given list of options.
Step-by-step explanation:
The object that is not a standard object is Leads. In a computer and technology context, standard objects refer to pre-defined objects provided by a software or programming language. Salesforce, for example, is a customer relationship management (CRM) platform that provides standard objects such as Accounts, Opportunities, and Invoices. However, Leads is typically a custom object that is created by users to track potential customers or sales leads.