Identify the incorrect statement regarding the centrosome and centriole.
$(a)$ The centrosome is surrounded by amorphous pericentriolar material.
$(b)$ In the centrosome,both centrioles lie parallel to each other,and both have a cartwheel-like structure.
$(c)$ The centriole is made up of peripheral tubulins from unspecified locations.
$(d)$ The central part of the centriole is a proteinaceous hub.

• A
  $a, b, c$
• B
  $b$
• C
  $b, c$
• D
  All are correct