Which license type should a data architect recommend that best fits these requirements?

Universal container (UC) would like to build a Human resources application on Salesforce to manage employee details, payroll, and hiring efforts. To adequately and store the relevant data, the application will need to leverage 45 custom objects. In addition to this, UC expects roughly 20,00 API calls into Salesfoce from an n-premises application daily.

Which license type should a data architect recommend that best fits these requirements?
A . Service Cloud
B . Lightning platform Start
C . Lightning Platform plus
D . Lightning External Apps Starts

Answer: C