What Is the 9 + 2 Array Seen in the Axoneme

Multiple Choice

What is the 9 + 2 array seen in the axoneme?

A) 2 central microtubules ringed by 9 microtubule doublets
B) 2 central microtubule doublets ringed by 9 microtubules
C) 9 central microtubules with 2 microtubules attached to each central microtubule
D) 9 central microtubules with 2 microtubule doublets attached to each central microtubule
E) none of the above