In what way does the Drake equation combine the various factors (e.g., fraction of stars with planets, fraction of planets that can support life) in an attempt to determine the number of technically advanced civilizations existing elsewhere in the Milky Way Galaxy?
A) The product of all the probabilities is calculated.
B) The sum of each of the factors is determined.
C) The sum of three factors is divided by the sum of the other four factors.
D) The sum of the last six factors is subtracted from the initial factor, the rate of solar-type star formation.
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