Read the following statements regarding the three critical research areas of biotechnology.
A: Providing the best catalyst in the form of improved organism usually a microbe or pure enzyme.
B: Creating optimal conditions through engineering for a catalyst to act.
C: Downstream processing technologies to purify the genetically modified organism.
Identify the correct statements.

• A

  A, B and C

• B

  A and B 

• C

  B and C

• D

  A and C