What Two Conditions Must Be in Place for an Officer

What two conditions must be in place for an officer to seize contraband that is in plain-view?

A) An officer must be lawfully on the premises, and the discovery must be inadvertent.
B) An officer must be able to clearly see the contraband, and a magistrate must verify probable cause after the seizure.
C) An officer must be conducting a warranted search, and the discovery must be incidental.
D) An officer must be granted permission to patrol the premises, and they must be granted consent from the owner of the property to seize the contraband that is spotted.