Below are data on the first four ionization energies for a fictitious element X.

First ionization energy = 500 kJ/mol

Second ionization energy = 2000 kJ/mol

Third ionization energy = 3500 kJ/mol

Fourth ionization energy = 25,000 kJ/mol

From the data, which of the following statements is(are) incorrect?

(a) X could belong to group IIIA.

(b) The fourth ionization energy is so much greater than the third ionization energy because X^{3 +} consists of a noble-gas core or a pseudo-noble-gas core.

(c) The third ionization energy is greater than the second ionization energy because X²⁺ has a bigger charge than X⁺.

(d) X could belong to group IIIB.

(e) X could belong to group VA.