Gait-Mats Are Useful to Assess Infant Walking Ability, However They

Gait-mats are useful to assess infant walking ability, however they are limited in that they

A) require infants to walk in a straight line.
B) only work when infants walk at a slow pace.
C) cannot assess length of footsteps.
D) require infants to be able to walk down an incline.
E) are only usable for infants under 12 months of age.