The expression of the recirculation factor F is given by ___________

• A. F = 1 / (1+0.1 (R/I))2
• B. F = (1+ R) / (1+0.1 (R/I))2
• C. F = (1+ I/R) / (1+0.1(R/I))2
• D. F = (1+ R/I) / (1+0.1(R/I))2