The overall delay of nMOS inverter pair is

• A. 4‚Äö√†√ú‚àö√ú
• B. ‚Äö√†√ú‚àö√ú
• C. 5‚Äö√†√ú‚àö√ú
• D. 2‚Äö√†√ú‚àö√ú