An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called

Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given with

Components:
(i) Cristae of mitochondria
(ii) Inner membrane of mitochondria
(iii) Cytoplasm
(iv) Smooth endoplasmic reticulum
(v) Rough endoplasmic reticulum
(vi) Mitochondrial matrix
(vii) Cell vacuole
(viii) Nucleus
The correct component are:

The figure below shows the structure of a mitochondrion with its four parts labelled $\left(\mathrm{A}\right), \left(\mathrm{B}\right), \left(\mathrm{C}\right)$ and $\left(\mathrm{D}\right)$. Select the part correctly matched with its function.