4. A dialyzing machine has a membrane that is permeable to water, urea, uric acid, ammonia, salts, and glucose. The membrane is impermeable to protein molecules. In relation to the blood flowing through the dialysis machine, the dialyzing solution must have A. lower concentrations of glucose and protein B. higher concentrations of urea, uric acid, and ammonia and lower or equal concentrations of glucose C. the same concentrations of urea and salts D. lower concentrations of urea, uric acid, and ammonia and higher or equal concentrations of glucose