Which lab results can be found in nutritional iron deficiency anemia
A
Serum iron concentration↓，total iron-binding capacity↓，transferrin saturation↓
B
Serum iron concentration↓，total iron-binding capacity↓，transferrin saturation↑
C
Serum iron concentration↓，total iron-binding capacity↑，transferrin saturation normal
D
Serum iron concentration↓，total iron-binding capacity↑，transferrin saturation↓
E
Serum iron concentration↓，total iron-binding capacity↑，transferrin saturation↑