The Law Enforcement-Confidential Informant Privilege

The law enforcement-confidential informant privilege:

A) has been interpreted to mean that the state is not required to disclose the name of the informant who gave information upon which probable cause for the search warrant was based.
B) provides that the state does not have to disclose informants even if the identity is essential to the defense.
C) is a privilege of the informant and may not be waived by the government.
D) cannot usually be claimed because public policy is not to protect the informant from reprisals.