Which diabetic drug classes should be considered in addition to metformin to prescribe for Alfonso and why?
a) Sulfonylureas and DPP-4 inhibitors to enhance insulin production
b) Biguanides and SGLT-2 inhibitors to increase glucose excretion
c) Thiazolidinediones and GLP-1 agonists to reduce insulin resistance
d) Meglitinides and alpha-glucosidase inhibitors to slow carbohydrate digestion