Match the followings:
| A. Astrocytes | I. Providing immune defense by removing debris and pathogens |
| B. Microglia | II. Generating and circulating cerebrospinal fluid |
| C. Oligodendrocytes | III. Supporting the blood-brain barrier and maintaining homeostasis |
| D. Ependymal Cells | IV. Forming the myelin sheath in the central nervous system |
1
A-II, B-III, C-IV, D-I
2
A-III, B-I, C-IV, D-II
3
A-III, B-I, C-II, D-IV
4
A-II, B-I, C-III, D-IV