The correct answer is D) white with orange geometric shapes. These types of navigational marks are known as regulatory or informational marks, and they are used to convey information to mariners rather than indicate the edges of a navigable channel. They are typically white with orange geometric shapes, such as diamonds, circles, or squares, to make them easily recognizable. The other answer choices are incorrect because they describe different types of navigational marks, such as solid yellow (channel markers), red and white vertically-striped (safe water marks), and green and red horizontally-banded (preferred channel marks), which have different purposes and are not used for informational or regulatory purposes.