• Statement (I): Denier is not an individual thread or filament; rather, a silk bave/thread is composed of two fibroin brins cemented by sericin, whereas denier is a standardized unit of measure. (Incorrect).
• Statement (II): Denier is the universal international textile unit of measurement for linear mass density of silk fibers and filaments, defined as the mass in grams of $9,000\text{ meters}$ of yarn:

(Correct).

• Conclusion: Statement (I) is incorrect but Statement (II) is correct.
• Correct Option: Option 4 (Statement (I) is incorrect but Statement (II) is correct).