Which of the following letter clusters will replace the question mark (?) in the given series to make it logically complete?
JZI3, LVL9, (?), PNR81, RJU243

Given: JZI3, LVL9, (?), PNR81, RJU243

Logic: In the given alphabetical series, add 2 to the place value of the first letter, subtract 4 from the place value of the second letter, and add 3 to the place value of the third letter. Also, multiply the number in each term by 3 to get the number in the next term.

J + 2 = L; L + 2 = N; N + 2 = P; P + 2 = R

Z - 4 = V; V - 4 = R; R - 4 = N; N - 4 = J

I + 3 = L; L + 3 = O; O + 3 = R; R + 3 = U

3 $$\times$$ 3 = 9; 9 $$\times$$​ 3 = 27; 27 $$\times$$​ 3 = 81; 81 $$\times$$​ 3 = 243​

So, the missing term in the series is NRO27.

Thus, the correct answer is (d).