Which abstract methods must be overridden for a Service-based Business Object?

Which abstract methods must be overridden for a Service-based Business Object?

A.
getVersion(), isCompatible(), init(),getServiceName()

B.
getVersion(), isCompatible(), supportsFeature(), getVendorString()

C.
getVersion(), isCompatible(), init(), getModuleName()

D.
getVersion(), isCompatible(), getVendorString(), getServiceName()