Read the following statements carefully and choose the correct statements.
$(A)$ In a transcription unit,the promoter is located at the $5'$ end of the coding strand.
$(B)$ The single strand $DNA$ having the polarity $5' \rightarrow 3'$ is the template strand.
$(C)$ $RNA$ polymerase binds to the operator during transcription.
$(D)$ Single base $DNA$ differences occurring in humans are called Single Nucleotide Polymorphisms $(SNPs)$.

• A
  Statements $(A)$ and $(B)$
• B
  Statements $(B)$ and $(C)$
• C
  Statements $(B)$ and $(D)$
• D
  Statements $(A)$ and $(D)$