Read the following statements w.r.t. lac...

Read the following statements w.r.t. lac operon.
a. lac-i is the constitutive gene.
b. lac-y codes for permease to increase permeability of cell to `Beta`-galactoside.
c. Lactose is the substrate for the enzyme B- galactosidase and it regulates switching on and off of the operon.
d. Regulation of lac operan can be also visualised as regulation of enzyme synthesis by its substrate.

(A), (B) only

(B). (C) only

(C), (D) only

(D) only

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