Which of the following refer to SAP Ariba solutions for direct spend? Note: there are 3 correct answers to this question.

Which of the following refer to SAP Ariba solutions for direct spend? Note: there are 3 correct answers to this question.
A . SAP Ariba Contracts
B. SAP Ariba Supply Chain Collaboration for Buyers
C. SAP Ariba Buying and Invoicing
D. SAP Supply Base Optimization
E. SAP Ariba Strategic Sourcing

Answer: B,D,E