Choose the correct statement(s) about amino acid handling by the kidneys (choose all that apply):
a. Above the transport maximum, amino acid is excreted at a higher rate compared to the filtration rate
b. Amino acid is secreted at the distal tubule
c. Amino acid is 100% reabsorbed if plasma level of amino acid is below the renal threshold
d. Amino acid is reabsorbed at the proximal tubule
e. Amino acid is reabsorbed at the distal tubule