A 70 year old insulin-dependent patient has just completed a 7 day course of ampicillin for a respiratory infection. He presents with signs and symptoms consistent with a diagnosis of oral candidiasis. Which of the following drugs is/are appropriate to manage this condition?
1. Fluconazole.
2. Nystatin.
3. Ketoconazole.
4. Clindamycin.

(2) and (4)

(1) (2) (3)

(1) and (3)

All of the above

(4) only