How Do CELL-DYN Instruments Differentiate Red Cells and Platelets from One

How do CELL-DYN instruments differentiate red cells and platelets from one another?

A) Differences in forward scatter using optical light scatter principle
B) Use of a unique reagent that selectively lyses red cells while preserving platelets
C) Differences in volume (fL) using electrical impedance principle
D) Use of a unique reagent that selectively lyses platelets while preserving red cells