Which of the Following Would Constitute a Violation of the Expectation

Which of the following would constitute a violation of the expectation of privacy of the curtilage to a home as it applies to the Fourth Amendment?

A) Using a low-flying airplane and a pair of binoculars to view the curtilage
B) Peering between the slats of a wooden fence surrounding the curtilage
C) Looking down over a fence around the curtilage from a tall, adjacent, public building
D) Running a fiber-optic camera under a fence surrounding the curtilage