Which of the following statements about electronegativity is the correct one?

Options

A. Electronegativity is the energy released when an electron is added to an atom of the element.
B. Electronegativity is the reciprocal of ionization energy.
C. Electronegativity is the same as that of ionisation energy
D. Electronegativity is the difference between ionisation energy and electron affinity of an element.