The crown of a tooth that is divided crosswise with the division being parallel to the occlusal or incisal surface of the tooth has which of the following divisions?

Select one:
a. Mesial third, middle third, and distal third
b. Occlusal third, middle third, and cervical third
c. Facial third, middle third, and lingual third
d. Incisal third, middle third, and lingual third