Normally Which of the Following Occur When the Kidneys Eliminate

Normally which of the following occur when the kidneys eliminate H⁺?
1) Sodium ions (and water) are reabsorbed.
2) HCO₃^- is reabsorbed in proportion to the H⁺ excreted.
3) Bicarbonate buffer capacity is restored.

A) 1, 2, and 3
B) 1 and 3 only
C) 2 only
D) 2 and 3 only