Biosynthesis of glutamine and asparagine is sensitive to light and to the availability of reduced carbon. Following are a few statements regarding the same.

A. Expression of the plastid-localized Glutamine Synthetase (GS) gene is upregulated by light.

B. Darkness promotes the expression of Asparagine Synthetase (AS) gene.

C. Expression of GS is inhibited by sucrose while that of AS is upregulated by sucrose.

D. Asparagine is a more efficient carbon source than glutamine.

Which one of the following options represents the combination of all correct statements?