What are two approaches for fulfilling these requirements?

Cloud Kicks has the following requirements:

– Data needs to be sent from Salesforce to an external system to generate invoices from their Order Management System (OMS).

– A Salesforce administrator must be able to customize which fields will be sent to the external system without changing code.

What are two approaches for fulfilling these requirements? (Choose two.)
A . A set<sobjectFieldset> to determine which fields to send in an HTTP callout.
B . An Outbound Message to determine which fields to send to the OM
D . A Field Set that determines which fields to send in an HTTP callout.
E . Enable the field -level security permissions for the fields to send.

Answer: B,C