The efficiency of a percolating filter is given by ___________

• A. 100/(1+0.0044 (μ))
• B. 100/(1+0.044 (μ) 1/2)
• C. 100/(1+0.44 (μ) 1/2)
• D. 100/(1+0.0044 (μ) 1/2)