Final answer:
Microglia characterized by light blue cytoplasm and purple-stained nuclei are correctly depicted with option (a) when using Giemsa-Wright stain.
Step-by-step explanation:
The student's question pertains to the characteristics of microglia when observed in Giemsa-Wright stained blood and bone marrow smears. The correct characteristic for these cells, when stained with this method, is a light blue cytoplasm and purple-stained nuclei. Therefore, the answer is (a) Light blue cytoplasm and purple-stained nuclei.