which of the responses is (are) correct.

pharmacy

which of the responses is (are) correct. Parameters that should be monitored include?

1    serum potassium levels

2    plasma digoxin concentration

3    ventricular rate at rest

A    if 1, 2 and 3 are correct

B    if 1 and 2 only are correct

C    if 2 and 3 only are correct

D    if 1 only is correct

E      if 3 only is correct