Step 1: Understanding Miller indices.
The Miller indices are derived from the intercepts of a plane with the crystallographic axes. For intercepts of \( a, a/2, 2a/3 \), the Miller indices are calculated by taking the reciprocals of the intercepts and clearing any fractions. The final result is (2 4 3), which corresponds to option (A).
Step 2: Conclusion.
Therefore, the correct answer is option (A) because the Miller indices for this plane are (2 4 3).