Which two functions are essential parts of a service oriented architecture (SOA) infrastructure?

A.
The service provider, which executes business logic in a stateless fashion

B.
The service consumer, which accesses services from the service repository

C.
The service repository, which stores software component metadata

D.
The service broker, which delivers well-defined service-level agreements

E.
The service look-up facility, which provides a central resource for naming and access