Use of an artificial kidney during hemodialysis may result in:
$(a)$ Nitrogenous waste build-up in the body
$(b)$ Non-elimination of excess potassium ions
$(c)$ Reduced absorption of calcium ions from gastrointestinal tract
$(d)$ Reduced $RBC$ production
Which of the following options is the most appropriate?

• A
  $(a)$ and $(b)$ are correct
• B
  $(b)$ and $(c)$ are correct
• C
  $(c)$ and $(d)$ are correct
• D
  $(a)$ and $(d)$ are correct