Match List-I with List-II.
| List-I | List-II |
|---|---|
| (a) Cristae | (i) Primary constriction in chromosome |
| (b) Thylakoids | (ii) Disc-shaped sacs in Golgi apparatus |
| (c) Centromere | (iii) Infoldings in mitochondria |
| (d) Cisternae | (iv) Flattened membranous sacs in stroma of plastids |
Choose the correct answer from the options given below: