What Needs to Be Done to Substitute One Dosage Form

What needs to be done to substitute one dosage form for another on a prescription?

A) Nothing needs to be done as long as the technician can figure the exact dose.
B) The technician needs to check with the physician.
C) Nothing needs to be done as long as the technician is changing only to a different solid dosage form.
D) The pharmacist must call and get permission from the prescriber.