The 4 Types of Secretory Cells in the Pancreatic Islets

The 4 types of secretory cells in the pancreatic islets are not present in the equal percentages.  Which of the following represents the correct approximate percentages for the 4 types of islet cells?

A) 80% beta cells, 15% alpha cells, 5% delta cells, <1% F cells
B) 80% delta cells, 15% alpha cells, 5% F cells, <1% beta cells
C) 80% delta cells, 15% F cells, 5% beta cells, <1% alpha cells
D) 80% alpha cells, 15% beta cells, 5% delta cells, <1% F cells
E) 80% F cells, 15% delta cells, 5% beta cells, <1% alpha cells