A polymer sheet with a cross-sectional area of 0.03 m2 and height of 5mm is used as a steady-state diffusional membrane in a drug delivery device. The drug concentration in the polymer is 300 mg/m3. The diffusion coefficient for the drug biomaterial combination is D = 10-8 m2/s. Estimate the flux through the membrane. 0.001 mg/m2s 0.006 mg/m2s 0.0045 mg/m2s 0.00032 mg/m2s