In SAP Ariba guided buying, which activities does a specialized item from enable requesters to perform?

In SAP Ariba guided buying, which activities does a specialized item from enable requesters to perform?
A . Initiate a sourcing request to centralized procurement
B. Order products that are NOT in the company catalog
C. Provide additional information to specify the product they want
D. Conduct three bids and a buy for highly technical items

Answer: D