In a Sneak-And-Peek Search Warrant

In a sneak-and-peek search warrant:

A) law enforcement officials first serve the warrant on the occupants but conduct the actual search while the occupants are not present.
B) law enforcement officials seek a search warrant after they first conduct a warrantless search of the premises in order to look around.
C) because of the danger involved,officers get a special warrant that allows them to sneak into the place to be searched without first knocking on the door to serve the warrant.
D) allow officers to enter a privately owned place without the owner or occupant consenting or even knowing about it.