The Contoso SharePoint on-premise intranet portal stores content in 50 site collections.
Contoso wants to display all content tagged with a metadata term on the main page of the portal.
You need to display all documents with the metadata term without using any custom code.
Which technology should you use?

A.
SPQuery with Site Collection set to the portal’s main page site collection

B.
Content Query Web Part (CQWP)

C.
Content Search Web Part (CSWP)

D.
SPSiteDataQuery

Explanation:
CSWP can be configured to “see” items anywhere in SharePoint.
Incorrect:
Not B, not D: CQWP and related SPSiteDataQuery can only search within the current site collection.
The Content Query Web Part has the following limitations:
/You can only aggregate data within a single site collection.
/You can only aggregate list information.
Using the Content Search web part (and understanding SP2013 search)