Which of the following statements describes how the 14-hour limit is calculated?

a. all on-duty and off-duty time accrued after coming on duty is included in the 14-hour limit.
b. a driver must be released from all duty after 14 consecutive hours.
c. stopping for lunch or taking a break extends the 14-hour limit.
d. all time besides time spent loading and unloading is included in the 14-hour limit.