In the Primary Somatosensory Cortex (SI)

In the primary somatosensory cortex (SI) :

A) All body parts are represented by equal amounts of cortex.
B) Body parts are represented by an amount of cortex proportional to their surface area.
C) The sensory homunculus has an upright position.
D) Proprioceptive and tactile information are directed to different parts of SI cortex and are examples of the labeled-line principle.