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 the search warrant after they first conduct a warrantless search of the premises 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) officers are allowed to enter a privately owned place without the owner or occupant consenting or even knowing about it.