Step 1: Classification of words.
In Vyakarana, words are categorized into four groups: Noun (Naam), Verb (Aakhyatah), Indeclinable (Nipatah), and Prefix (Upsargah).
Step 2: Correct order.
The traditional order begins with Naam (nouns), followed by Aakhyatah (verbs), then Nipatah (indeclinables), and finally Upsargah (prefixes).
Step 3: Matching options.
Option (2) represents this exact sequence: B, A, C, D.
Step 4: Conclusion.
Thus, the correct series is Naam, Aakhyatah, Nipatah, Upsargah.