Find all values of x where the function is discontinuous. k(x)=x-4 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The function is discontinuous when x> B. The function is discontinuous when x OC. The function is discontinuous when x < OD. The function is discontinuous when x> OE. The function is discontinuous when x = (Use a comma to separate answers as needed.) OF. The function is continuous for all x-values.