What Does "Habitable Zone Around a Star" Mean in the Current

Multiple Choice

What does "habitable zone around a star" mean in the current framework of the search for exoplanets?

A) the region around the star where the inhabitants of nearby planetary systems can safely visit
B) the region around the star where planetary temperatures would not be too hot or too cold for liquid water to exist
C) the region around the star where planets have icy moons
D) the region around the star where planets can form an atmosphere
E) the region around the star where intelligent civilizations are not exposed to harmful doses of radiation