Consider the following statements of gene regulation and select the correct statements $:$
$(A)$ Expression of genes is regulated by metabolic,physiological,or environmental conditions.
$(B)$ Galactose can act as an inducer for the lac operon.
$(C)$ The operator region is adjacent to the promoter elements in most operons.
$(D)$ In the lac operon,lactose is transported into the cell through the action of permease.
$(E)$ Regulation of the lac operon by a repressor is referred to as positive regulation.

• A
  Only $(A), (C), (D)$ and $(E)$
• B
  Only $(B), (D)$ and $(E)$
• C
  Only $(A)$ and $(D)$
• D
  Only $(A), (C)$ and $(D)$