What is the function of the Rough endoplasmic reticulum RER$)?$

A$.$ "Powerhouse" of cell $($most cells contain numerous mitochondria$)$

Synthesizes adenosine triphosphate $($ATP$),$ which provides chemical energy for cellular respiration $($through oxidative phosphorylation$)$

B$.-$ Synthesizes lipids $($especially membrane phospholipids$)$

Detoxifies drugs and alcohol

Metabolizes carbohydrates

Stores calcium $($i$.$e$.,$ in sarcoplasmic reticulum$)$

C$.$ Formation and breakdown of intracellular hydrogen peroxide $($which can be used to oxidize alcohol, formaldehyde, and phenols$)$

Breakdown of fatty acids

Involved in bile acid synthesis in liver

D$.-$ Digests macromolecules, microorganisms, old or damaged organelles

E$.-$ Synthesizes protein for secretion$,$ insertion into plasma membrane, and lysosomal enzymes and other proteins