Given here is the histological diagram of the mammalian stomach. Its mucosal membrane is profusely folded and the pit-like infoldings distally form numerous simple or branched tubular gastric glands occurring in the fundus and corpus part. The principal type of cells found in each gland are labeled 1 - 4.

Choose the correct option representing Pepsinogen, Hydrochloric Acid, Gastrin Hormone and Mucus-secreting cells, respectively (1 to 4).