In TOGAF, what is the difference between an artifact and a deliverable?

In TOGAF, what is the difference between an artifact and a deliverable?
A . An artifact contains one or more deliverables
B . Artifacts and deliverables are synonymous; there is no difference between them
C . Deliverables are prepared by the Project Manager, whereas artifacts are defined by the Architect
D . Deliverables are reusable, whereas artifacts are unique to a given architecture project
E . Deliverables are specified as contractual outputs from a project, whereas artifacts are not

Answer: E