Read the following statements and select the correct option.
(a) To facilitate more sound and scientific placement of various taxa, taxonomists have also developed subcategories.
(b) Only a few protozoans are heterotrophs and live as predators or parasites. 

• A

  Both (a) and (b) are correct

• B

  Only (a) is correct

• C

  Only (b) is correct

• D

  Both (a) and (b) are incorrect