Which of the following is the best description of an obelisk?

An obelisk is a tall, four-sided monument that tapers towards the top and is typically topped with a pyramid shape or an apex. It is often made of a single stone or multiple stones stacked together. Obelisks are typically freestanding and can be found in various locations around the world, serving as landmarks or memorials. They were popular in ancient Egyptian and Roman architecture and often feature hieroglyphs or inscriptions on their sides.