Which of the second order harmonics functions is used to model the buldge of the Earth?

Which of the second order harmonics functions is used to model the buldge of the Earth? Correct Answer Zonal coefficient J2

The equatorial buldge of the Earth is modelled using the second order spherical harmonic function with zonal coefficient J2. This is about 1000 times larger than the other Jk coefficients.
Bissoy MCQ

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Which of the second order harmonics functions is used to model the bulge of the Earth?
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