What should the administrator do, prior to rebuilding the index, so users are able to find items based on the X-Header value?

An administrator has enabled SMTP archiving. Some messages contain a custom X-Header called “Company.ConfidentialPlans” that is indexed by Enterprise Vault. Using Enterprise Vault Search, the administration notices that searches for the X-Header value return no items, but that the correct value of the X-Header is visible as a column in the results of other searches.

What should the administrator do, prior to rebuilding the index, so users are able to find items based on the X-Header value?
A . SMTP Policy > X-Headers tab > select the Searchable checkbox
B . SMTP Policy > X-Headers tab > change the name of the X-Header to “Company.ConfidentialPlans.Searchable”
C . SMTP Policy > X-Headers tab > change the Type setting to “Searchable”
D . SMTP Policy > X-Headers tab > deselect the Retrievable checkbox

View Answer

Answer: D