How Can Astronomers Currently Determine the Temperature of an Extrasolar

How can astronomers currently determine the temperature of an extrasolar planet?

A) estimate the temperature based on the planet's distance from the star
B) measure the drop in total infrared light when the planet passes behind the star from our perspective
C) use spectroscopy of the planet to identify the wavelength at which its emission peaks
D) A and B
E) B and C

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