Which of the Following Best Describes How the Drake Equation

Multiple Choice

Which of the following best describes how the Drake equation is useful?

A) It has allowed us to determine the number of civilizations in the Milky Way Galaxy.
B) It allows us to calculate the masses of planets orbiting other stars.
C) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence.
D) It helps us understand what we need to know in order to determine the likelihood of finding other civilizations.