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Which of the following is the correct relation between lift dependent drag, lift independent drag and drag coefficient?

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Which of the following is the correct relation between lift dependent drag, lift independent drag and drag coefficient?

(a) CD=CDz+KCL^2

(b) CD=CDz-KCL^2

(c) CD=CDz*KCL^2

(d) CD=CDz/KCL^2

The question was asked in homework.

Origin of the question is Drag Force in portion Aircraft Force Systems and the Equations of Motion of Aircraft Performance

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Correct choice is (a) CD=CDz+KCL^2

The best explanation: The correct relation between lift dependent drag, lift independent drag and drag coefficient is CD=CDz+KCL^2 where CD is drag coefficient, CDz is lift independent drag, CL is lift independent drag and K is a constant.

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