Which approach should you recommend?

You are designing a SharePoint 2010 server farm that consists of multiple site collections that share enterprisewide
content types. The content types are updated on a monthly basis to ensure proper governance. The farm
uses a managed metadata service application.
You need to ensure that all the site collections automatically receive the updated content types in the most efficient manner and with the least amount of custom development.
Which approach should you recommend?

A.
Configure Content Type Syndication to update the central site collection as changes are made to each individual site collection.

B.
Configure Content Type Syndication to update the individual site collection lists as changes are made to a central site collection.

C.
Create an event receiver in a central site collection that sends updates to the individual site collections as changes are made.

D.
Create an event receiver in each individual site collection that sends updates to the central site collection as changes are made.