Step 1: Word Classification.
Vyakarana classifies words into four categories: Noun (Naam), Verb (Aakhyatah), Indeclinable (Nipatah), and Prefix (Upsargah).
Step 2: Standard Word Order.
The conventional sequence is Naam (nouns), then Aakhyatah (verbs), followed by Nipatah (indeclinables), and lastly Upsargah (prefixes).
Step 3: Option Correlation.
Option (2) aligns with this established sequence: B, A, C, D.
Step 4: Final Determination.
Therefore, the correct order is Naam, Aakhyatah, Nipatah, Upsargah.