What is true about dialysis $\_\_\_\_?$

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Group of answer choices

This is a process of removing urea and other waste products from the blood by$$human kidneys.$$

This is a process of removing urea and other waste products from urine by$$human kidneys.

This is a process of removing urea and other waste products from the blood artificially by a machine by diffusion.

This is a process of removing urea and other waste products from the urine artificially by a machine by diffusion.

None of the above $($a$,$ b$,$ c$,$ & d$)$ is correct.