The cardinal movements of labor are:
A. Engagement, internal rotation, external rotation, and expulsion
B. Internal rotation, descent, flexion, external rotation, and expulsion
C. Engagement, descent, flexion, internal rotation, external rotation, and extension
D. Engagement, descent, flexion, internal rotation, extension, external rotation, and expulsion
E. Descent, flexion, internal rotation, extension, external rotation, expulsion