Which Processes Does Urea Undergo Within the Kidney

Multiple Choice

Which processes does urea undergo within the kidney?

A) It is filtered but neither reabsorbed nor secreted.
B) It is filtered and can be reabsorbed and secreted.
C) It is filtered and can also be secreted but not reabsorbed.
D) It is not filtered nor reabsorbed but can be secreted.
E) It is not filtered but can be secreted and reabsorbed.