The Drake Equation is used to

estimate the probability of communication occurring between intelligent extraterrestrial life and human civilizations. It includes a number of factors, including the number of habitable planets and the likelihood of intelligent life developing on other planets. Carl Sagan argues that the high number of habitable planets makes the probability of communication high. Ernst Mayr argues that the likelihood of intelligent life developing on those planets makes the probability of communication low.
What is the issue at hand? Is it a subjective or objective issue?

a) A subjective issue, whether the probability of humans receiving contact from extraterrestrial life is high or low.

b) An objective issue, whether the probability of humans receiving contact from extraterrestrial life is high or low.

c) A subjective issue, whether the Drake equation is good at predicting the probability of contact with intelligent extraterrestrial life.

d) An objective issue, whether the Drake equation is good at predicting the probability of contact with intelligent extraterrestrial life.