After engaging in a 12-week balance and fitness training class for individuals with AD, one participant demonstrates a 0.12 m/sec increase in gait speed. You conclude that this a. Does not meet the established minimal detectable change (MDC) and is therefore not a true change in performance. b. Does not meet the established MDC and is therefore a true change in performance. c. Meets the established MDC and is therefore a true change in performance. d. Meets the established MDC and is therefore not a true change in performance