What is the difference between pre-positioned and pre-loaded content in an ACNS 5.X Content Delivery Network?

A.
Pre-loaded content is content that has been fetched by the root Content Engine and distributed to all the Content Engines.
Pre-positioned content is content that all Content Engines fetch independently from an origin server.

B.
Pre-loaded content is content that has been fetched by the Content Distrubution Manager and distributed to all the Content
Engines. Pre-positioned content is content that all Content Engines fetch independently from an origin server.

C.
Pre-positioned content is content that has been fetched by the root Content Engine and distributed to all the Content Engines.
Pre-loaded content is content that all Content Engines fetch independently from an origin server.

D.
Both are exactly the same and do the same function.

E.
Pre-positioned content is content that has been fetched by the Content Distrubution Manager and distributed to all the Content
Engines. Pre-loaded content is content that all Content Engines fetch independently from an origin server.