What are two types of oral insulin secretagogues?
a) Sulfonylureas and Biguanides
b) Thiazolidinediones and Dipeptidyl peptidase-4 (DPP-4) inhibitors
c) Alpha-glucosidase inhibitors and Meglitinides
d) Sodium-glucose co-transporter 2 (SGLT2) inhibitors and Incretin mimetics