Which of the following contain the 9 + 2 arrangement of microtubules,consisting of nine doublets of microtubules surrounding a pair of single microtubules?

A)both motile cilia and primary (nonmotile)cilia
B)centrioles only
C)both flagella and motile cilia
D)both basal bodies and primary (nonmotile)cilia
E)both centrioles and basal bodies