Which of the following best describes a semimetal/s?

A semimetal has characteristics of both non-metals and metals and is thus located in the middle of the periodic table.

Semimetals have characteristics of both non-metals and metals and they act as borders with all the metals lying to their left and all of the non-metals on their right.

Semimetals are also called metalloids and represent the second-largest classification for elements.

Semimetals lie on an imaginary staircase (from boron, B, to astatine, At) and have characteristics of both metals and non-metals.