The equivalent penetration resistance is given by ___________

• A. Nₑ=15+\(\frac{1}{2}\)(N+15)
• B. Nₑ=\(\frac{1}{2}\)(N-15)
• C. Nₑ=15+\(\frac{1}{2}\)(N-15)
• D. Nₑ=15+\(\frac{1}{2}\)(N)