Under What Circumstance Does the Open Fields Doctrine Allows Police

Under what circumstance does the open fields doctrine allows police officers to search?for and seize evidence in the open fields?

A) if they have probable cause that the items are concealed within the curtilage
B) if they have a warrant, probable cause or some other justification
C) with a warrant or probable cause, having reasonable suspicion
D) without a warrant, probable cause, or any other justification